Answer: Rose leaves yellow due to poor fertility, too much or little water or disease such as powdery mildew. Make sure your roses are well feed with compost in spring and rose food throughout the growing season. Mulch to conserve water and don't water if Mother Nature already has been doing a good job on it for you. Check the leaves for a white powdery growth. Powdery mildew can be eliminated from roses with a mix of 3 teaspoons baking soda, 2 tablespoons summer oil mixed in a quart of water and sprayed on the leaves.
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