Shrub

A shrub or bush is a small to medium-sized perennial woody plant. Unlike herbaceous plants, shrubs have persistent woody stems above the ground. Shrubs can be either deciduous or evergreen. They are distinguished from trees by their multiple stems and shorter height, less than 6–10 m (20–33 ft) tall, the cutoff point varying within this range for any one species due to suitability of growing conditions in any one environment. Some tree species never achieve their mature height because of hostile, less than ideal growing conditions in certain areas, and can resemble shrub-sized plants. Small shrubs, less than 2 m (6.6 ft) tall are sometimes termed as subshrubs. Some shrub species only last about five years in good conditions, while others, usually larger and more woody, live beyond 70 years; on average, shrub species die after about eight years.