Gardeners identify berry plants based on the thickness of leaves and thorns and the roundness of stems. The leaves on plants are different in their colors and textures, which makes it easier to identify a particular plant.
Blueberry bushes have very glossy leaves that are green or a little bluish green,, while blackberry plants have dark green leaves with white fuzz on the surface.
Each berry plant has thorns of different thicknesses. Blackberry plants have thicker thorns compared to black raspberry plants, while red raspberry plants have very fine thorns.
The roundness of plants' stems clearly differentiates raspberries and blackberries. The stems of blackberry plants have sides that look concave, while raspberry plant stems are almost round.