Adenium obesum are succulent shrubs with irregular shapes. Their fleshy and heavy trunks may be buried half or entirely in the soil, preferrably in a plant container where excess water could be flushed out. … The large basal caudex is actually part of the exposed root system which makes this plant special and alluring.
The soil should be moist, not wet, and there should be no standing water. Use a well-drained soil and allow the soil mix to dry out thoroughly before watering again. If you plant directly into the landscape, be certain to position your Adenium on a bit of an incline so the water can drain off after heavy rains.