Roses yellow leaf are one of the most common garden plants to suffer from a yellow leaf, but this is often a telltale sign of an underlying problem. This could be a fungal disease, a soil issue or a nutrient imbalance. If the foliage turns yellow, it won’t be able to perform photosynthesis as effectively, which can starve the plant of vital energy and make it vulnerable to further problems.

A common cause of yellow leaves on roses is that the foliage doesn’t get enough sunlight. This can be caused by nearby trees, shrubs or buildings blocking the rays of the sun on the lower growth of the plant. If this is the case, try to find out what is blocking the rays and either move the plant to more sunny locations or thin out any overgrowth.

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Another reason for yellow leaves on roses is that the soil is too wet. This can happen if you water too much in cool weather, if the ground doesn’t drain quickly or if there is a clog in the drainage holes. It’s best to check the soil for a pH imbalance with a home testing kit and then amend it as needed.

Fungus diseases can also turn the leaves of a rose yellow and darken them, particularly black spot and cercospora leaf spot (CLS). Both of these fungal diseases create splotches on the leaves that look like rust. A fungicide like Metataxyl will help cure this disease.