"Tall shrubs" refers to plants that are smaller than trees but larger than typical bushes. They have a height that is significant and can create privacy or provide shade in a garden or landscape. Full definition
Next to a field of walnut trees near the university, a row of tall shrubs planted by the researchers stretches for several hundred yards: western redbud, coffeeberry, gum plant, sage, coyote brush. (scientificamerican.com)
Senna is a 3 - foot tall shrub that primarily grows in North Africa. (vitamin-insight.com)
In Canada, the ground is dominated by tall shrubs like willow and birch but in the Northwestern European forests found in Norway, Finland and Sweden the ground is dominated by dwarf shrubs like bilberry. (sciencedaily.com)