The problem could be a lack of iron, or soil that is too alkaline. When soil pH is above 6.5, rose roots can't access the iron they need from the soil. Nitrogen deficiency causes uniform, light yellow-green leaves that start at the bottom and work their way up. The leaves will get more yellow as time goes on.. Understanding why rose leaves turn yellow is crucial for every horticulturalist, professional gardener, and rose enthusiast.. There are several factors that can cause yellow leaves in rose bushes. These include light, heat stress, radiant heat, excess or deficient watering, incorrect use of fertilizer, nutrient deficiencies, and various.

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If you've been noticing leaves on your roses turning yellow, it's important to learn the reasons why and address the problem. The eight reasons for yellow leaves on roses include: Too much fertilizer. Drought stress. Overwatering. Deficiencies in the soil. Diseases that affect rose plants. Pests that affect rose plants. Insufficient sunlight.. Chlorosis is a common problem for roses, and it is the main reason why rose leaves turn yellow. It is caused by a lack of chlorophyll in the leaves, which is essential for photosynthesis. Several factors can contribute to chlorosis, including poor drainage, low fertility, high pH, and drought stress. It can also be caused by fungal diseases.