Rocks On Plants . Rocks & plants is an outdoor furnishing set. Use perennials, ornamental grasses and small shrubs to add vertical height. 25 Plants That Grow on Rocks Yard Surfer from yardsurfer.com The fragments accumulate in low. Sedimentary rocks are formed from eroded fragments of other rocks or even from the remains of plants or animals. Plot crack width data and plant growth over time, and compare the data sets.