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There’s nothing more frustrating for a gardener than watching a vibrant and thriving plant change appearance. What was once a spectacle to be admired can quickly change to a specimen that looks lackluster and distressed.If you’ve ever grown roses in your yard, you may have experienced the same effect. Those once-beautiful showstoppers, with a fragrant scent and glossy leaves, can quickly succumb to all sorts of issues, leaving you with a rose shrub with yellowing leaves.While the problem is not insurmountable, the challenge lies in pinpointing what has caused your rose leaves to turn yellow, and then knowing how to put it right. Here I break down the likely culprits and share how to fix those yellow leaves1. The watering is off balance

(Image credit: Shutterstock)If you’ve noticed the leaves on your rose bush have turned yellow, it could be a sign that the plant is under- or overwatered. You can check if the plant is too dry by placing a finger into the soil. If the top couple of inches feel dry, it needs a drink.However, it could also mean the plant is too wet. If this is the case, you might also notice the soil is soggy, the leaves are wilting, and there is a musty odor.The trick is getting the balance right. Roses are best planted in well-draining soil; however, if the soil is sandy, it will drain much more quickly, and your plant will need more frequent watering.Roses will appreciate a good, long drink at their roots rather than short, frequent waterings on their leaves.Get instant access to breaking news, the hottest reviews, great deals and helpful tips.2. The rose lacks nutrients