Permaculture is a branch of ecological design and ecological engineering which develops sustainable human settlements and self-maintained agricultural systems modeled from natural ecosystems.[1][2] It is also a form of systems theory.
The core tenets of permaculture are:
- Care of the Earth: Provision for all life systems to continue and multiply.
- Care of People: Provision for people to access those resources necessary for their existence.
- Setting Limits to Population and Consumption: By governing our own needs, we can set resources aside to further the above principles.[3][4]
Permaculture design emphasizes patterns of landscape, function, and species assemblies. It asks the question, “Where does this element go? How can it be placed for the maximum benefit of the system?" To answer this question, the central concept of permaculture is maximizing useful connections between components and synergy of the final design. The focus of permaculture, therefore, is not on each separate element, but rather on the relationships created among elements by the way they are placed together; the whole becoming greater than the sum of its parts. Permaculture design therefore seeks to minimize waste, human labor, and energy input by building systems with maximal benefits between design elements to achieve a high level of synergy. Permaculture designs evolve over time by taking into account these relationships and elements and can become extremely complex systems that produce a high density of food and materials with minimal input.[5]
Permaculture draws on the application of ecological theory to analyze the characteristics of a farm, garden, or home site. Each element of a design is carefully analyzed in terms of its needs, outputs, and properties. Design elements are then assembled in relation to one another so that the products of one element feed the needs of adjacent elements. Such relationships organizes are commonly organized in spatial patterns common in natural systems.
Common permaculture practices include the use of polyculture agriculture, perennial plants, rainwater harvesting, and terraforming.
The core of permaculture has always been in supplying a design toolkit for human habitation. This toolkit helps the designer to model a final design based on an observation of how ecosystems interact.
- Observe and interact: By taking time to engage with nature we can design solutions that suit our particular situation.
- Catch and store energy: By developing systems that collect resources at peak abundance, we can use them in times of need.
- Obtain a yield: Ensure that you are getting truly useful rewards as part of the work that you are doing.
- Apply self-regulation and accept feedback: We need to discourage inappropriate activity to ensure that systems can continue to function well.
- Use and value renewable resources and services: Make the best use of nature's abundance to reduce our consumptive behavior and dependence on non-renewable resources.
- Produce no waste: By valuing and making use of all the resources that are available to us, nothing goes to waste.
- Design from patterns to details: By stepping back, we can observe patterns in nature and society. These can form the backbone of our designs, with the details filled in as we go.
- Integrate rather than segregate: By putting the right things in the right place, relationships develop between those things and they work together to support each other.
- Use small and slow solutions: Small and slow systems are easier to maintain than big ones, making better use of local resources and producing more sustainable outcomes.
- Use and value diversity: Diversity reduces vulnerability to a variety of threats and takes advantage of the unique nature of the environment in which it resides.
- Use edges and value the marginal: The interface between things is where the most interesting events take place. These are often the most valuable, diverse and productive elements in the system.
- Creatively use and respond to change: We can have a positive impact on inevitable change by carefully observing, and then intervening at the right time.[6]
Permaculture design focuses heavily upon natural patterns. All things, even the wind, the waves and the Earth moving around the Sun, form patterns. In pattern application, permaculture designers are encouraged to develop an awareness of the patterns that exist in nature (and how these function) and how patterns can be utilized to satisfy the specific design needs of a specific site. "The application of pattern on a design site involves the designer recognizing the shape and potential to fit these patterns or combinations of patterns comfortably onto the landscape".[7]
The edge effect in ecology is the effect of the juxtaposition or placing side by side of contrasting environments on an ecosystem. Permaculturists maintain that, where vastly differing systems meet, there is an intense area of productivity and useful connections. An example of this is the coast; where the land and the sea meet there is a particularly rich area that meets a disproportionate percentage of human and animal needs. So this idea is played out in permacultural designs by using spirals in the herb garden or creating ponds that have wavy undulating shorelines rather than a simple circle or oval (thereby increasing the amount of edge for a given area). Edges between woodland and open areas have been claimed to be the most productive.[8]
A guild is any group of species that exploit the same resources, often in related ways.[9][10][11] Guilds are groups of plants, animals, insects, etc. that work well together. Some plants may be grown for food production, some to attract beneficial insects, and others to repel harmful insects. When grouped together these plants form a guild.
The end goal is to have a garden that requires little or no ongoing human maintenance or resource inputs. Everything that is added into the system either improves the system or degrades the system. Finding those plants or animals that complement each other, is the first step in designing a useful system. The Three Sisters of maize, squash and beans is a well known example. Guilds can be thought of as an extension of companion planting.
Zones are a way of organizing design elements in a human environment on the basis of the frequency of human use and plant or animal needs. Frequently manipulated or harvested elements of the design are located close to the house in zones 1 and 2. Less frequently used or manipulated elements, and elements that benefit from isolation (such as wild species) are farther away. Zones is about positioning things appropriately. Zones are numbered from 0 to 5.
- Zone 0
- The house, or home center. Here permaculture principles would be applied in terms of aiming to reduce energy and water needs, harnessing natural resources such as sunlight, and generally creating a harmonious, sustainable environment in which to live and work. Zone 0 is an informal designation, which is not specifically defined in Mollison's book.
- Zone 1
- The zone nearest to the house, the location for those elements in the system that require frequent attention, or that need to be visited often, such as salad crops, herb plants, soft fruit like strawberries or raspberries, greenhouse and cold frames, propagation area, worm compost bin for kitchen waste, etc. Raised beds are often used in zone 1 in urban areas.
- Zone 2
- This area is used for siting perennial plants that require less frequent maintenance, such as occasional weed control or pruning, including currant bushes and orchards. This would also be a good place for beehives, larger scale composting bins, and so on.
- Zone 3
- The area where maincrops are grown, both for domestic use and for trade purposes. After establishment, care and maintenance required are fairly minimal (provided mulches and similar things are used), such as watering or weed control maybe once a week.
- Zone 4
- A semi-wild area. This zone is mainly used for forage and collecting wild food as well as timber production.
- Zone 5
- A wild area. There is no human intervention in zone 5 apart from the observation of natural ecosystems and cycles.
Layers are one of the tools used to design functional ecosystems that are both sustainable and of direct benefit to man. A mature ecosystem has a huge number of relationships between its component parts: trees, understory, ground cover, soil, fungi, insects, and animals. Because plants grow to different heights, a diverse community of life is able to grow in a relatively small space, as each layer is stacked one on top of another. There are generally seven recognized layers in a food forest, although some practitioners also include fungi as an eighth layer:
- The canopy: the tallest trees in the system. Large trees dominate but do not saturate the area, i.e. there exist patches barren of trees.
- Low tree layer: dwarf fruit trees, citrus trees and other short trees
- Shrubs: a diverse layer that includes most berry bushes
- Herbaceous: may be annuals, biennials or perennials; most annuals will fit into this layer
- Rhizosphere: root crops including potatoes and other edible tubers
- Soil surface: cover crops to retain soil and lessen erosion, along with green manures to add nutrients and organic matter to the soil, especially nitrogen
- Vertical layer: climbers or vines, such as runner beans and lima beans (vine varieties)
Agroforestry is an integrated approach of using the interactive benefits from combining trees and shrubs with crops and/or livestock. It combines agricultural and forestry technologies to create more diverse, productive, profitable, healthy and sustainable land-use systems.[12] In agroforestry systems, trees or shrubs are intentionally used within agricultural systems, or non-timber forest products are cultured in forest settings. Knowledge, careful selection of species and good management of trees and crops are needed to optimize the production and positive effects within the system and to minimize negative competitive effects. Forest gardening is a type of agroforestry that is particularly popular with permaculture designers.
Animals are often incorporated into the site design. Chickens can be used as a method of weed control and also as a producer of eggs, meat and fertilizer. Bill Mollison stated that "animals represent a valid method of storing inedible vegetation as food."[13]
However not all permaculture sites keep animals for meat, eggs or milk. Sometimes animals function as pets or are treated as co-habitats and co-workers of the site, eating foods normally unpalatable to people such as slugs and termites, being an integral part of the pest management by eating some pests, supplying fertilizer through their droppings and controlling some weed species.
Other projects avoid the use of domesticated animals altogether.[14] Vegan permaculture (also known as veganic permaculture, veganiculture or vegaculture) is essentially the same as permaculture except for the addition of "Animal Care" as a fourth core value alongside "Earth Care, People Care and Fair Share."[15] Zalan Glen, a raw vegan, proposes that vegaculture should emerge out of permaculture in the same way veganism split from vegetarianism in the 1940s.[15]
In
passive solar building design, windows, walls, and floors are made to collect, store, and distribute solar energy in the form of heat in the winter and reject solar heat in the summer.
Current industrial agricultural systems of food production are not fully renewable. Industrial agriculture uses large amounts of petroleum and natural gas, both to run the equipment, and to supply pesticides and fertilizers. Permaculture is in part an attempt to create a renewable system of food production that relies upon minimal amounts of energy.
Traditional pre-industrial agriculture was labor intensive, industrial agriculture is fossil fuel intensive, and permaculture is design and information intensive and attempts to be petrofree. Partially permaculture is an attempt to work smarter, not harder; and when possible renewable energy designs such as Passive solar building design should be used.
Peak oil is the point in time when the maximum rate of global petroleum extraction is reached, after which the rate of production enters terminal decline. Mollison and Holmgren have both written extensively on the topic, and it is a much discussed concept amongst permaculturists. Applying permaculture principals means using fewer non-renewable sources of energy, and particularly petroleum based forms of energy.
A natural building involves a range of building systems and materials that place major emphasis on sustainability. Ways of achieving sustainability through natural building focus on durability and the use of minimally processed, plentiful or renewable resources, as well as those that, while recycled or salvaged, produce healthy living environments and maintain indoor air quality. Natural building tends to rely on human labor, more than technology.
The basis of natural building is the need to lessen the environmental impact of buildings and other supporting systems, without sacrificing comfort, health or aesthetics. To be more sustainable, natural building uses primarily abundantly available, renewable, reused or recycled materials. In addition to relying on natural building materials, the emphasis on the architectural design is heightened. The orientation of a building, the utilization of local climate and site conditions, the emphasis on natural ventilation through design, fundamentally lessen operational costs and positively impact the environmental. Building compactly and minimizing the ecological footprint is common, as are on-site handling of energy acquisition, on-site water capture, alternate sewage treatment and water reuse.
Rainwater harvesting systems channel rainwater from a roof into a storage tank via an arrangement of gutters and pipes.
Rainwater harvesting is the accumulating and storing of rainwater for reuse before it reaches the aquifer. It has been used to provide drinking water, water for livestock, water for irrigation, as well as other typical uses. Rainwater collected from the roofs of houses and local institutions can make an important contribution to the availability of drinking water. It can supplement the subsoil water level and increase urban greenery. Water collected from the ground, sometimes from areas which are especially prepared for this purpose, is called stormwater harvesting.
Greywater is wastewater generated from domestic activities such as laundry, dishwashing, and bathing, which can be recycled on-site for uses such as landscape irrigation and constructed wetlands. This wastewater contains no feces or urine. Greywater differs from water from the toilets which is designated sewage or blackwater, to indicate it contains human waste, but it is suitable as a source of water for toilets.
In agriculture and gardening, mulch is a protective cover placed over the soil. Any material or combination can be used as mulch, stones, leaves, plastic, cardboard etc., though in Permaculture mulches of organic material are the most common because they perform more functions. These include: absorbing rainfall, reducing evaporation, providing nutrients, increasing organic matter in the soil, feeding and creating habitat for soil organisms, suppressing weed growth and seed germination, moderating diurnal temperature swings, protecting against frost, and reducing erosion. Sheet mulching is an agricultural no-dig gardening technique that attempts to mimic natural processes occurring within forests, sheet mulching mimics the leaf cover that is found on forest floors. When deployed properly and in combination with other Permacultural principles, it can generate healthy, productive and low maintenance ecosystems.[16][17]
Sheet mulch serves as a "nutrient bank," storing the nutrients contained in organic matter and slowly making these nutrients available to plants. It also improves the soil by attracting and feeding earthworms, and adding humus. Earthworms "till" the soil, and their worm castings are among the best fertilizers and soil conditioners. Sheet mulching can be used to reduce or eliminate undesirable plants by starving them of light, and may be more advantageous than using herbicide or other methods of control.
The term permaculture (as a systematic method) was first coined by Australians Bill Mollison and David Holmgren during the 1970s. The word "permaculture" originally referred to "permanent agriculture" but was expanded to stand also for "permanent culture," as it was seen that social aspects were integral to a truly sustainable system. Inspired by Fukuoka natural farming philosophy, Mollison has described permaculture as "a philosophy of working with, rather than against nature; of protracted and thoughtful observation rather than premature and thoughtless labor; and of looking at plants and animals in all their functions, rather than treating any area as a single project system."[18]
Permaculture draws from several disciplines including organic farming, agroforestry, integrated farming, sustainable development, and applied ecology. "The primary agenda of the movement has been to assist people to become more self reliant through the design and development of productive and sustainable gardens and farms. The design principles which are the conceptual foundation of permaculture were derived from the science of systems ecology and study of pre-industrial examples of sustainable land use."[19]
Franklin Hiram King coined the term permanent agriculture in his classic book from 1911, Farmers of Forty Centuries: Or Permanent Agriculture in China, Korea and Japan. In this context, permanent agriculture is understood as agriculture that can be sustained indefinitely.
In 1929, Joseph Russell Smith took up the term as the subtitle for Tree Crops: A Permanent Agriculture, a book in which he summed up his long experience experimenting with fruits and nuts as crops for human food and animal feed.[20] Smith saw the world as an inter-related whole and suggested mixed systems of trees and crops underneath. The definition of permanent agriculture as that which can be sustained indefinitely was supported by Australian P. A. Yeomans in his 1973 book Water for Every Farm. Yeoman introduced an observation-based approach to land use in Australia in the 1940s; and the keyline design as a way of managing the supply and distribution of water in the 1950s.
Stewart Brand's works were an early influence noted by Holmgren.[21] Brand is an advocate of systems thinking and was a major figure in the counterculture movement of the Sixties and Seventies. Systems thinking proposes to view systems in a holistic manner. Other early influences include Ruth Stout and Esther Deans, who pioneered "no-dig gardening methods", and Masanobu Fukuoka[22] who, in the late 1930s in Japan, began advocating no-till orchards, gardens and natural philosophy.
The first recorded modern application of permaculture concepts as a systematic method was possibly by Austrian farmer Sepp Holzer in the 1960s.[23] Coming from a line of farmers, Holzer took over his parents' mountain farm business in 1962 and pioneered the use of ecological farming techniques, that will be identified later as permaculture techniques, at high altitudes (1100 to 1500 meters above sea level). He never believed in regular farming methods. The methods he learned in agriculture school did not work in his mountain farm business. As in permaculture, his secret of success is to think about interactions among neighboring plants and animals. He found that symbiosis can be more effective and less expensive than using fertilizer.
In the mid-1970s, Bill Mollison and David Holmgren started developing ideas about stable agricultural systems on the southern Australian island state of Tasmania. This was a result of the danger of the rapidly growing use of industrial-agricultural methods. In their view, highly dependent on non renewable resources, these methods were additionally poisoning land and water, reducing biodiversity, and removing billions of tons of topsoil from previously fertile landscapes. A design approach called "permaculture" was their response and was first made public with the publication of their book Permaculture One in 1978.
By the early 1980s, the concept had broadened from agricultural systems design towards complete, sustainable human habitats. After Permaculture One, Mollison further refined and developed the ideas by designing hundreds of permaculture sites[citation needed] and writing more detailed books, notably Permaculture: A Designers Manual. Mollison lectured in over 80 countries and taught his two-week Permaculture Design Course (PDC) to many hundreds of students.
By the mid-1980s, many of the students had become successful practitioners[citation needed] and had themselves begun teaching the techniques they had learned. In a short period of time permaculture groups, projects, associations, and institutes were established in over one hundred countries. In 1991, a four-part television documentary by ABC productions called "The Global Gardener" showed permaculture applied to a range of worldwide situations, bringing the concept to a much broader public. In 2012, the UMass Permaculture Initiative won the White House "Champions of Change" sustainability contest, which declared that "they demonstrate how permaculture can feed a growing population in an environmentally sustainable and socially responsible manner".[24]
There has been contention over who if anyone controls the legal rights to the word "Permaculture", meaning is it trademarked or copyrighted, and if so, who holds the legal rights to the use of the word. For a long time Bill Mollison claimed to have copyrighted the word permaculture, and his books reflected that on the copyright page, saying "The contents of this book and the word PERMACULTURE are copyright." These statements were largely accepted at face-value within the permaculture community. However, copyright law does not protect names, ideas, concepts, systems, or methods of doing something; it only protects the expression or the description of an idea, not the idea itself. Eventually Mollison acknowledged that he was mistaken and that no copyright protection existed for the word "permaculture".[25]
Mollison explained that the word "permaculture" was copyrighted to protect the quality of teaching, particularly with relation to the Permaculture Design Course (PDC), a 72 hour course usually taught over a period of 14 days. The PDC is a formal means of training an individual the ideas and techniques associated with permaculture. Mollison's argument was if the word was copyrighted, then only those who had been trained and shown to have a reasonable level of proficiency would be allowed to teach the PDC. However, some of those who taught the PDC wanted to adjust the curriculum to better reflect the local conditions of where it was being taught. For example, should a course taught in an urban setting such as New York City be unchanged from what is taught in rural Australia? Mollison was adamant that the curriculum should be taught as he had designed it, without being altered.
In 2000 Mollison's US based Permaculture Institute sought a service mark (a form of trademark) for the word permaculture when used in educational services such as conducting classes, seminars, or workshops.[26] The service mark would have allowed Mollison and his two Permaculture Institutes (one in the US and one in Australia) to set enforceable guidelines as to how permaculture could be taught and who could teach it, particularly with relation to the PDC. The service mark failed and was abandoned in 2001. Also in 2001 Mollison applied for trademarks in Australia for the terms "Permaculture Design Course"[27] and "Permaculture Design".[28] These applications were both withdrawn in 2003. In 2009 he sought a trademark for " Permaculture a Designers' Manual"[29] and "Introduction to Permaculture",[30] the names of two of his books. These applications were withdrawn in 2011. There has never been a trademark for the word Permaculture in Australia.[31]
Some critics have questioned common permaculture advocates' use of scientific data to support their claims of what creates "higher productivity of more mature ecosystems" promoted by permaculture advocates.[32] These claims are based on Odum extensive work on ecosystem productivity, and ecological succession theory. Some critics also claim that woods can not be more highly productive than farmland, as ecological succession states that net productivity declines when forests mature. Proponents of permaculture respond that this is true only if one compares data from between woodland forest and climax vegetation, but not when comparing farmland vegetation with woodland forest.[33] Ecological succession more precisely states that land productivity first rises with forest establishment until reaching the woodland state, with 66% of tree cover, before declining until full maturity.[5] Primary production concept explore this aspect in details.
Although permaculture basic concepts ground in traditional scientific knowledge of ecology, critics found it is often difficult to find scientifically tested data that validate certain claims promoted by permaculture advocates, and conclude that they neglect the scientific approach.[32] Proponents of permaculture respond that supporting its basic concepts, permaculture design applies and combines scientific findings from organic gardening, agroforestery and ecology research, such as plant companionship, composting or mycorhizhal benefits. Such classic scientific data demonstrates the benefit on productivity of growing mutual beneficial plants together compared to growing them separately.[citation needed] But for more elaborate concepts, such as raised bed design and efficiency, extensive scientific data is still lacking.
Proponents of permaculture admit that historically permaculture developed first as a collection of farming practices rather than a scientific theory, and as such did not yet developed a large corpus of scientifically validated data. But they argue that complexity in permaculture, as in applied ecology, make it inherently difficult to validate scientifically. Permaculture design take advantage of multiple relationship to build non-linear systems, known to be to difficult to predict, isolate and test in the lab with traditional methods. This inadequacy of science with living system complexity is largely described by an early permaculture inspirer, Fukuoka, and attested by his career radical conversion from pathological botanics research to philosophical natural farming. More recently, Owen Hablutzel made a step forward, and associated permaculture design with chaos mathematics and ecology concepts, such as ecological succession and attractors, to apply permaculture in a field study on draught and salinity remediation with impressive empirical scientific results of pH, salinity and compaction reduction, and water infiltration rise.[34]
Some other critics and practitioners, identify permaculture to a set of spiritual, ethic and moral rules, and claim that permaculture is a system of belief and behavior that has or need no scientific justification. Permaculture conceptual proximity with biodynamics can lead to similar confusions. As an example, companion plants determination from chromatography in biodynamics, is highly disregarded from most permaculture practitioners.
Permaculture critics also focus on the lack of clarity and scientific inexactitude of various permaculture advocates. In his books “Sustainable Freshwater Aquaculture” and "Farming in ponds and dams", Nick Romanowki expresses the view that the presentation of aquaculture in Bill Mollison's books is unrealistic and misleading.[35] Linda Chalker-Scott claims that Toby Hemenway's views regarding invasive species in the permaculture book "Gaia's Garden" are pseudo-science.[36][37]
- ^ Hemenway, Toby (2009). Gaia's Garden: A Guide to Home-Scale Permaculture. Chelsea Green Publishing. p. 5. ISBN 978-1-60358-029-8. http://books.google.com/books?id=gxW0MGXha6cC&pg=PA5#v=onepage.
- ^ Mars, Ross (2005). The Basics of Permaculture Design. Chelsea Green Publishing. p. 1. ISBN 978-1-85623-023-0. http://books.google.com/books?id=MWb6i-G6QAkC&pg=PA1.
- ^ Greenblott, Kara, and Kristof Nordin. 2012. Permaculture Design for Orphans and Vulnerable Children Programming: Low-Cost, Sustainable Solutions for Food and Nutrition Insecure Communities. Arlington, VA: USAID's AIDS Support and Technical Assistance Resources, AIDSTAR -One, Task Order 1. http://www.aidstar-one.com/focus_areas/ovc/resources/technical_briefs/permaculture_for_OVC
- ^ Mollison, Bill (1988). Permaculture: A Designers' Manual. Tagari Publications. p. 2. ISBN 0-908228-01-5.
- ^ a b "Edible Forest Gardening". http://www.edibleforestgardens.com/.
- ^ "Permaculture - Peak Oil - The Source of Permaculture Vision and Innovation". Holmgren.com.au. http://www.holmgren.com.au. Retrieved 2011-10-21.
- ^ Sampson-Kelly
- ^ Plants for a Future - The woodland edge garden
- ^ Simberloff, D; Dayan, T (1991). "The Guild Concept and the Structure of Ecological Communities". Annual Review of Ecology and Systematics 22: 115. DOI:10.1146/annurev.es.22.110191.000555.
- ^ "Encyclopaedia Britannica article on guilds". Britannica.com. http://www.britannica.com/eb/article-70591/community-ecology. Retrieved 2011-10-21.
- ^ Williams, SE; Hero, JM (1998). "Rainforest frogs of the Australian Wet Tropics: guild classification and the ecological similarity of declining species". Proceedings. Biological sciences / the Royal Society 265 (1396): 597–602. DOI:10.1098/rspb.1998.0336. PMC 1689015. PMID 9881468. //www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1689015.
- ^ "USDA National Agroforestry Center (NAC)". Unl.edu. 2011-08-01. http://www.unl.edu/nac/. Retrieved 2011-10-21.
- ^ Bill Mollison (1988). Permaculture: A Designers' Manual. p. 5. "Deer, rabbits, sheep, and herbivorous fish are very useful to us, in that they convert unusable herbage to acceptable human food. Animals represent a valid method of storing inedible vegetation as food."
- ^ "Introduction to Permaculture - Compatibility with Veganic Agriculture". Veganic Agriculture Network. http://www.goveganic.net/spip.php?article68.
- ^ a b Zalan Glen (2009). From Permaculture to Vegaculture. The Movement for Compassionate Living - New Leaves (issue no.93). pp. 18-20. http://www.mclveganway.org.uk/Publications/New_Leaves/NL93.pdf.
- ^ "Sheet Mulching: Greater Plant and Soil Health for Less Work". Agroforestry.net. 2011-09-03. http://www.agroforestry.net/pubs/Sheet_Mulching.html. Retrieved 2011-10-21.
- ^ Sustainable Agriculture by J. Mason, Landlinks Press 2003
- ^ "Healthy Environments and You". ShirleyMacLaine.com, Inc. and MacLaine Enterprises, Inc.. http://www.shirleymaclaine.com/articles/environment/article-292. Retrieved 10 September 2011.
- ^ Oliver Holmgren (1997). "Weeds or Wild Nature". Permaculture International Journal. http://www.holmgren.com.au/frameset.html?http://www.holmgren.com.au/html/Writings/weeds.html. Retrieved 10 September 2011.
- ^ Smith, Joseph Russell; Smith, John (1987). Tree Crops: A permanent agriculture. Island Press. http://books.google.co.uk/books?id=0PQvqpVnFbAC&lpg=PP1&vq=permaculture&pg=PP1#v=onepage&q&f=false.
- ^ David Holmgren (2006). "The Essence of Permaculture". Holmgren Design Services. http://www.holmgren.com.au/frameset.html?http://www.holmgren.com.au/html/Writings/weeds.html. Retrieved 10 September 2011.
- ^ Mollison, Bill (1978 September 15–21). "The One-Straw Revolution by Masanobu Fukuoka". Nation Review: p. 18.
- ^ "Permaculture". http://www.letsgogardening.co.uk/I_Permaculture.htm.
- ^ "UMass Amherst permaculture project wins White House award". http://www.boston.com/Boston/politicalintelligence/2012/03/umass-amherst-permaculture-project-wins-white-house-award/r2XazdAkdr4SrYpzQWBT7K/index.html.
- ^ Russ Grayson (2011). "The Permaculture Papers 5: time of change and challenge — 2000-2004". www.pacific-edge.info. http://pacific-edge.info/the-permaculture-papers-5-time-of-change-and-challenge-%E2%80%94-2000-2004/. Retrieved 8 September 2011. "In a letter to me, the Institute explained that they were seeking the trademarks because they had been mistaken in their belief that the terms were protected by copyright. This belief had endured for years, Bill occasionally making public statements about copyright protecting Permaculture and how it could be used. Copyright protects only the expression of an idea, not the idea itself, the Institute confirmed. Copyright protected Bill’s books as an expression of Permaculture, but the idea of Permaculture itself and the elements that make it up remained unprotected"
- ^ United States Patent and Trademark Office (2011). "Trademark Electronic Search System (TESS)". US Department of Commerce. http://tess2.uspto.gov/bin/showfield?f=doc&state=4005:o81il1.2.1. Retrieved 8 September 2011. "Word Mark PERMACULTURE -Goods and Services (ABANDONED) IC 041. US 100 101 107. G & S: Educational services, namely, conducting classes, seminars, and workshops on environmental, sustainable design for homeowners, farmers, ranchers, and other land based enterprises. This design system is known as Permaculture. Providing educational materials for above trainings. - Filing Date September 7, 2000 - (APPLICANT) Permaculture Institute Inc. CORPORATION NEW MEXICO P. O. Box 3702 Pojoaque NEW MEXICO 87501 - Type of Mark SERVICE MARK - Live/Dead Indicator: DEAD - Abandonment Date August 28, 2001 - Serial Number 78024882"
- ^ IP Australia (2011). "Enter as a Guest; Basic Search; You can also search by trade mark number: 877106". Commonwealth of Australia. http://pericles.ipaustralia.gov.au/atmoss/Falcon.Result. Retrieved 8 September 2011. "Word: PERMACULTURE DESIGN COURSE, New Trade Mark Application 28-MAY-2001, Withdrawal Advertised: 09-JAN-2003, Status: Withdrawn, XAF Pty Ltd ACN: 009521260 31 Rulla Road SISTERS CREEK TAS 7325 AUSTRALIA - Bill Mollison 31 Rulla Road SISTERS CREEK TAS 7325 AUSTRALIA - Lisa Mollison 31 Rulla Road SISTERS CREEK TAS 7325 AUSTRALIA, Class: 41 Education and training in the field of sustainable land use and landscape design, Trade Mark : 877106"
- ^ IP Australia (2011). "Enter as a Guest; Basic Search; You can also search by trade mark number: 877449". Commonwealth of Australia. http://pericles.ipaustralia.gov.au/atmoss/Falcon.Result. Retrieved 8 September 2011. "Word: PERMACULTURE DESIGN, New Trade Mark Application (multi-class) 30-MAY-2001, Withdrawal Advertised: 09-JAN-2003, Status: Withdrawn, XAF Pty Ltd ACN: 009521260 31 Rulla Road SISTERS CREEK TAS 7325 AUSTRALIA - Bill Mollison 31 Rulla Road SISTERS CREEK TAS 7325 AUSTRALIA - Lisa Mollison 31 Rulla Road SISTERS CREEK TAS 7325 AUSTRALIA, Class: 16 Books, pamphlets, printed material all in the field of sustainable land use, landscape design and food security Class: 41 Education and training in the field of sustainable land use and landscape design, Class: 42 Consulting for others in the fields of sustainable land use and landscape design, Trade Mark : 877449"
- ^ IP Australia (2011). "Enter as a Guest; Basic Search; You can also search by trade mark number: 1319992". Commonwealth of Australia. http://pericles.ipaustralia.gov.au/atmoss/Falcon.Result. Retrieved 8 September 2011. "Word: Permaculture a Designers' Manual, Filing Elec Appl'n for TM - Pick List 3 Classes 10-SEP-2009, Applications Lapsed and Withdrawn (Lapsed): 24-MAR-2011, Status: Lapsed/Not Protected, Owner/s: XAF Pty Ltd ITF The Permaculutre Institute ACN: 009521260 31 Rulla Road SISTERS CREEK TAS 7325 AUSTRALIA - Bill Mollison 31 Rulla Road SISTERS CREEK TAS 7325 AUSTRALIA - Lisa Mollison 31 Rulla Road SISTERS CREEK TAS 7325 AUSTRALIA, Class: 9 Computer hardware publications in electronic form; electronic publications (downloadable), Class: 16 Printed publications, Class: 41 Providing online electronic publications (not downloadable), Trade Mark : 1319992"
- ^ IP Australia (2011). "Enter as a Guest; Basic Search; You can also search by trade mark number: 1321705". Commonwealth of Australia. http://pericles.ipaustralia.gov.au/atmoss/Falcon.Result. Retrieved 8 September 2011. "Word: Introduction to Permaculture, Filing Elec Appl'n for TM - Pick List 3 Classes 21-SEP-2009, Applications Lapsed and Withdrawn (Lapsed): 31-MAR-2011, Status: Lapsed/Not Protected, Owner/s: XAF Pty as trustee for The Permaculutre Institute ACN: 009521260 31 Rulla Road SISTERS CREEK TAS 7325 AUSTRALIA - Bill Mollison 31 Rulla Road SISTERS CREEK TAS 7325 AUSTRALIA - Lisa Mollison 31 Rulla Road SISTERS CREEK TAS 7325 AUSTRALIA, Class: 9 Electronic publications (downloadable); electronic publications including those sold and distributed online, Class: 16 Printed publications, Class: 41 Providing online electronic publications (not downloadable), Trade Mark : 1321705"
- ^ IP Australia (2011). "Enter as a Guest; Basic Search; You can also search by trade mark number: 345002". Commonwealth of Australia. http://pericles.ipaustralia.gov.au/atmoss/Falcon.Result. Retrieved 8 September 2011.
- ^ a b Williams, Greg (2001). "Gaia's Garden: A Guide to Home-Scale Permaculture". Whole Earth. http://webcache.googleusercontent.com/search?q=cache:xIuXvGwog_IJ:findarticles.com/p/articles/mi_m0GER/is_2001_Winter/ai_81790195/+http://findarticles.com/p/articles/mi_m0GER/is_2001_Winter/ai_81790195/&cd=1&hl=en&ct=clnk&gl=au&source=www.google.com.au.
- ^ "A toolbox, not a tool". Findarticles.com. http://www.findarticles.com/p/articles/mi_m0GER/is_2001_Winter/ai_81790196. Retrieved 2011-10-21.
- ^ http://www.youtube.com/watch?feature=player_embedded&v=V3twLVn7nss#t=3690s
- ^ http://www.permacultureinternational.org/Members/fernrainbow/nick-crit
- ^ https://sharepoint.cahnrs.wsu.edu/blogs/urbanhort/archive/2010/04/28/permaculture-beginning-a-discussion.aspx
- ^ https://sharepoint.cahnrs.wsu.edu/blogs/urbanhort/archive/2010/05/26/permaculture-my-final-thoughts.aspx
- Bell, Graham. The Permaculture Way. 1st edition, Thorsons, (1992), ISBN 0-7225-2568-0, 2nd edition Permanent Publications (UK) (2004), ISBN 1-85623-028-7.
- Bell, Graham. The Permaculture Garden. Permanent Publications (UK) (2004), ISBN 1-85623-027-9.
- Burnett, Graham. Permaculture: A Beginner's Guide. Spiralseed (UK).
- Fern, Ken. Plants For A Future. [Permanent Publications] (UK) (1997). ISBN 1-85623-011-2. Google Books link
- Fukuoka, Masanobu. The One Straw Revolution. Rodale Books (US). Holistic Agriculture Library
- Holmgren, David. Permaculture: Principles and Pathways Beyond Sustainability. Holmgren Design Services (Australia).
- Holmgren, David. "Update 49: Retrofitting the suburbs for sustainability". CSIRO Sustainability Network
- Hart, Robert. Forest Gardening. Green Books (UK) ISBN 1-900322-02-1.
- Hemenway, Toby. Gaia's Garden. Chelsea Green Books (US) (2001). ISBN 1-890132-52-7.
- Jacke, Dave with Eric Toensmeier. Edible Forest Gardens. Volume I: Ecological Vision and Theory for Temperate-Climate Permaculture, Volume II: Ecological Design and Practice for Temperate-Climate Permaculture. Edible Forest Gardens (US) 2005
- King, FH (Franklin Hiram) Farmers of Forty Centuries: Or Permanent Agriculture in China, Korea and Japan (1911).
- Law, Ben. The Woodland House. [Permanent Publications] (UK) (2005), ISBN 1-85623-031-7.
- Law, Ben. The Woodland Way. [Permanent Publications] (UK), ISBN 1-85623-009-0.
- Loofs, Mona. Permaculture, Ecology and Agriculture: An investigation into Permaculture theory and practice using two case studies in northern New South Wales Honours thesis, Human Ecology Program, Department of Geography, Australian National University 1993
- Mollison, Bill & David Holmgren Permaculture One. Transworld Publishers (Australia) (1978), ISBN 0-552-98060-9.
- Mollison, Bill. Permaculture: A Designer's Manual. Tagari Press (Australia).
- Mollison, Bill Permaculture Two. Tagari Press (Australia) (1979), ISBN 0-908228-00-7.
- Odum, H.T., Jorgensen, S.E. and Brown, M.T. 'Energy hierarchy and transformity in the universe', in Ecological Modelling, 178, pp. 17–28 (2004).
- Paull, J. "Permanent Agriculture: Precursor to Organic Farming", Journal of Bio-Dynamics Tasmania, no.83, pp. 19–21, 2006. Organic eprints.
- Rosemary Morrow, Earth User's Guide to Permaculture ISBN 0-86417-514-0
- Whitefield, Patrick. Permaculture In A Nutshell. Permanent Publications (UK) (1993), ISBN 1-85623-003-1.
- Whitefield, Patrick. The Earth Care Manual. Permanent Publications (UK) (2004), ISBN 1-85623-021-X.
- Woodrow, Linda. The Permaculture Home Garden. Penguin Books (Australia).
- Yeomans, P.A. Water for Every Farm: A practical irrigation plan for every Australian property, K.G. Murray Publishing Company, Pty, Ltd, Sydney, N.S.W., Australia (1973).
- Various, The Same Planet a different World.. free eBook [1] (France).
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