Rose bush leaves can turn yellow when there is an issue with light, water, pests, disease, fertilizer or heat stress, according to Gardening Know How. After yellowing, the bush may lose the leaves entirely.
Lower leaves can yellow when they do not get enough light. There are several pest and disease problems that are characterized by yellow leaves. Leaves can yellow to try to cool the plant from heat stress. Too much fertilizer can "burn" the plant, causing leaf yellowing and drop off. Also, sun rays can bounce off water droplets around the base of the plant, causing yellowing and leaf burn.Learn More
Hosta leaves can turn yellow from frost, sunburn, heat stress and disease. Like people, trees and plants are not immune to disease, injury and harm from the elements. Hosta plants are no exception, and like many plants and trees that sport foliage, they express physical harm and stress through the condition of their leaves.Full Answer >
Rose bush leaves can turn yellow due to lack of water, spider mites or fungal diseases, such as blackspot and rust. Other symptoms are necessary to identify the exact cause of the yellowing.Full Answer >
Fixes for yellowing gardenia leaves include cutting back on watering, adjusting the pH of the soil and adding magnesium or iron, according to Gardening Know How. Chlorosis, or the condition that causes yellowing of the leaves, occurs when a plant does not have enough chlorophyll.Full Answer >
Late winter is the best time to prune a rhododendron, according to Gardening Know How. Planting any time during the dormant season, which is late fall to early spring, will also work.Full Answer >