A shrub or bush is distinguished from a tree by its multiple stems and shorter height, usually under 5–6 m (15–20 ft) tall. A large number of plants may become either shrubs or trees, depending on the growing conditions they experience. Small, low shrubs such as lavender, periwinkle and thyme are often termed subshrubs.

An area of cultivated shrubs in a park or garden is known as a shrubbery. When clipped as topiary, shrubs generally have dense foliage and many small leafy branches growing close together. Many shrubs respond well to renewal pruning, in which hard cutting back to a 'stool' results in long new stems known as "canes". Other shrubs respond better to selective pruning to reveal their structure and character.

Shrubs in common garden practice are generally broad-leaved plants, though some smaller conifers such as Mountain Pine and Common Juniper are also shrubby in structure. Shrubs can be either deciduous or evergreen.

In botany and ecology a shrub is more specifically used to describe the particular physical structural or plant life-form of woody plants which are less than 8 metres (26 ft) high and usually have many stems arising at or near the base.

Mike Harmon (born January 24, 1958) is an American race car driver. Currently, he drives the #74 Mike Harmon Racing Chevrolet in the NASCAR Nationwide Series. In the past, he drove in the NASCAR Slim Jim All Pro Series, finishing 8th in points in 1997. He has also racked up 300 feature wins in short-track competition during his racing career.

Harmon made his NASCAR debut in 1996 driving the #24 MedPartners Chevrolet at South Boston Speedway, where he finished 31st after a transmission failure. He ran seven more races in the car that season, with a best finish of 23rd, but a sponsorship struggle caused his team to close down. He was scheduled to return to NASCAR in 1999, when he signed with Donlavey Racing to compete for NASCAR Winston Cup Rookie of the Year honors with Big Daddy's BBQ Sauce sponsoring. Unfortunately, Big Daddy's never paid, and Harmon was reportedly fired from the team during preparation for that year's Daytona 500 when he refused to let another driver try to get more speed out of the car.