This rare plant is one of the big clumping Caralluma that can reach one meter in height. It bears at the apex a many-flowered clusters of brownish-black flowers, similar in form and size to those of Campanula Trachelium.
Caralluma speciosa is relatively easy to grow. It needs regular watering, especially during the hottest summer days; provide also some light watering if the green house temperatures in winter are elevated. Either excessive or very scarce watering can induce rot. Frost Tolerance: Winter temperatures must be kept over 10° C. But it can withstand winter night-time temperatures down to about 5°(or less) Celsius for short period. Freezing temperatures are fatal. Sun Exposure: Full sun to half sun. It has a great advantage if grown in very strong light, but sheltered from full sun.