STUNNING SHRUBS Shrubs or bushes are woody plants that branch in or close to the ground. Unlike trees, they generally do not form a clear trunk, but most species develop a number of stems, known as basal stems. Size does not determine whether a plant is a tree or a shrub. Some shrubs grow very tall but most do not grow above three to four metres. Shrubs–the term does them no favours, yet shrubs are a fantastic group of plants that are valuable in so many ways.