We tend to give more importance to colours than to shape and texture. However, if you reduce colours to a single one - green - shapes and textures become a lot more noticeable as well as more significant and easy to appreciate.
The contrast of shape and texture is more obvious in the early part of the gardening season, before the "actual" colours take center stage, and we start ignoring the backdrop for the garden. In these pictures taken in late spring, the various greens are more distinct and fresh. I try to illustrate the play of shape and texture, without the diversion created by various colours.