Adenium Leaves Turning Yellow . The insufficiency can be due to high pH levels in the soil, low iron or lack of oxygen due to overwatering or. Rose bush leaves exhibit a pale green or yellow color when they suffer from chlorophyll insufficiency. Desert Rose Plant 'Yellow Gift' (Adenium hybrid) for sale ... (Minnie Schultz) Overwatering or underwatering are the most common culprits when a plant's leaves turn yellow. The leaves on geraniums turn yellow when they get too much to drink. The desert rose flowering plant grows well in desert settings and will bloom beautifully with full, bright sun. Usually easy to grow when given the right conditions, leaves on a Desert Rose might turn yellow and start to fall. Answer: If a plant has been grown and maintained hydroponically (in water), yellowing can be caused quickly by a lack of nutrient since no soil is available. Desert Rose Plant 'Yellow Gift' (Aden...