In a very bright, warm environment such as a greenhouse, Adenium can remain active during the winter months. If you bring your plant indoors for the winter, it will probably stay in a semi-dormant state until spring. During this time, just keep it in a warm room with bright, indirect light.
Water moderately in hot weather and sparingly in cool weather
Desert Rose has a nice, warm rainy season, but when the weather is cold, you need to cut back on watering. Some say it’s best to think of your Adenium as a tropical plant in the spring and summer and as a cactus in the fall and winter.
The most important thing to remember is that the roots must never become waterlogged. During the growing season, check the soil every few days in container plants. When the plant is completely dry, water slowly and carefully. Saturate the soil, but do not soak it. The soil should be moist, not wet, and there should be no standing water. Use a well-drained soil and allow the soil mixture to dry out thoroughly before watering again.
If planting directly in the landscape, be sure to place your Adenium on a bit of a slope so that the water can run off after heavy rains. Desert Rose growing outdoors is incredibly drought tolerant and may not need to be watered once established. In times of extreme drought, water deeply, sometimes with a slow drip for several hours during the coolest part of the day.