Crassula rupestris

Buttons-on-a-string

A densely branched shrubby succulent up to about 60 cm tall, with stacked, grey-green leaves. It grows on rocky slopes across the Western and Eastern Cape into Namibia. It needs full sun, a gritty sandy mix and water mainly in the cooler growing months.

Crassula rupestris — Photo: User:BotBln, CC BY 2.5, via Wikimedia Commons

At home, aim for

Day Cool-growingTargets in Plantistry

Night Close to the dayTargets in Plantistry

Humidity Dry airBand in Plantistry

Light Full sunDLI and PPFD in Plantistry

Expects a seasonal restGrows on rock (lithophyte)

Where it grows wild

It grows on rocky outcrops and slopes, as its name suggests, in sandy, well-drained soils. Most records come from the Little Karoo, Robertson Karoo and the surrounding mountains, where it grows in succulent karoo, renosterveld and dry fynbos.

The records carry no elevation. They are mostly in the lowlands and foothills of the Western Cape interior.

Western CapeEastern CapeNorthern CapeSouthern Namibia

🔒 Growing it like that

The wild conditions above, turned into targets for a shelf, a tent or a greenhouse. The full profile has:

✓ Day and night temperature targets, and the limits it tolerates

✓ Humidity band, and how to hold it

✓ Light as DLI and PPFD for a grow light

✓ Wet and dry seasons, and whether to rest it

✓ Substrate and airflow

✓ A step-by-step setup to grow it like the wild

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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app. Photo from Wikimedia Commons, used under its CC BY 2.5 licence, unmodified.