Adenium plants are native to regions with poor, gritty soil and hot, sunny climates. You can’t expect the plant to thrive in overly moist soil, in a site with limited light. They are also not frost tolerant and will succumb to a freeze if exposed. 

Desert rose succulents like bright light, so a southern window exposure provides enough sun for the plants to flourish and bloom.

Soil is very important. Adenium plants should have a mixture of cactus soil with gritty sand or lava rocks for good drainage.