Easily confused with Reflex Stonecrop (sometimes called Large Rock Stonecrop), but Reflex Stonecrop purportedly has flowers with only six petals not seven; possesses no flats on the stem-ward side of the longer leaves; and the leaves splay out further from the stem, exposing themselves skywards rather than stem-wards. Unlike Rock Stonecrop, no lower leaves of Reflex Stonecrop are dead. Reflex Stonecrop is slightly taller than Rock Stonecrop, and also has a tendency for the flowering stems to flop over at the top, hence the name reflex.

Rock stonecrop lives mainly on walls, rocks, scree and shingle, but can frequently be seen escaping from gardens.

Although nominally having seven petals, specimens with 5, 6 and 7 petals can be seen on a single flowering stem even on the few photos presented here. So has 7 petals may not be a very reliable identification feature.

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