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A shrub or bush is a small- to medium-sized
Shrubs are perennial woody plants, and therefore have persistent woody stems above ground (compare with
Some definitions state that a shrub is less than 6 m and tree is over 6 m. Others use 10 m as the cut off point. Many species of tree may not reach this mature height because of less than ideal growing conditions, and resemble a shrub sized plant. However such species have the potential to grow taller under the ideal growing conditions for that plant.
Most definitions characterize shrubs as possessing multiple stems with no main trunk. This is because the stems have branched below ground level. There are exceptions to this, with some shrubs having main trunks, but these tend to be very short and divide into multiple stems close to ground level. Many trees can grow in multiple stemmed forms also, such as