Adenium requires direct sunlight and fresh air; plants grown in shade will flower poorly, become leggy, and are more susceptible to diseases. However, it is necessary to protect the newly exposed portions (caudex) from direct sun, or sunscald may occur.
Adeniums in general respond to high temperatures. An ideal temperature for better growth and flowering is 30-35° Celsius, preferably accompanied by moderate to high humidity. However, growth and flowering seem to be suppressed by temperatures consistently above 38° Celsius.
Proper watering is the key to keeping your Adenium healthy. Frequency of watering depends on container and soil mix used to plant and of course temperature. Adenium needs more water when plants actively growing and hot summer days. During monsoon and winter water requirement is less as soil retains moisture for a longer period due to slow absorption by plants.
Desert rose requires excellent drainage in any soil mix; if it is not provided, the roots rot, resulting in poor growth or death of the plant. The soil mix also must have moisture retention properties, along with adequate nutrients. Use a mixture of one part coarse sand, half part coco peat and half part worm compost or well rotted cow dung, which will hold some moisture but still drain nicely.
During the first 2–3 yrs young plants make rapid growth if provided with adequate fertilizer, then growth slows down as they mature. Give young plants a full strength complete liquid fertilizer every 2 wks. For more mature plants, reduce or eliminate the liquid fertilizer, but use slow release fertilizer.
Usually pruning is done to reduce overall plant size, or to selectively remove branches to ‘sculpt’ a more-perfect plant