I have ten desert rose plants. Vey nice flower and dark green leaves. Then, somehow on all ten plants, the leaves turned yellow and fell off. Am wondering why. And what caused the leaves to turn yellow and fall off? Thank you.
There are several causes for yellowing foliage, but the number one reason is stress-underwatering, nutrient deficiency, shock, pests, etc. Pinpointing the cause for this stress is important in treating the plant. This article should provide some ideas: https://www.gardeningknowhow.com/plant-problems/environmental/plant-leaves-turn-yellow.htm