Living rock can refer to dwarf succulent plants resembling stones, especially of the genera:

Oil weed was a low plant, resembling bracken.

The main attraction of this exceptionally inventive sculptor's exhibition is a pair of plants resembling palm trees cast from life in gray polyurethane.

It is a small floating plant resembling a small water lily.

They have a plant somewhat resembling the sugar-cane, but its juices are less sweet and of a delicate perfume.

It is a gray-leaved herbaceous perennial plant, somewhat resembling mint in appearance, which grows to 25-45 cm tall.

This deceitful appearance is caused by a small plant resembling saxifrage, which is abundant, growing in large patches on a species of crumbling moss.

Cycads are plants resembling ferns, although not related to them.

S. pinguicula is a short, erect plant resembling a dwarf agave.

We saw an English jujube tree, a plant resembling an overgrown bush, with several trunks, round, dark green leaves and thorns, growing in a dry riverbed.