Answer: Based on your description I am unable to tell you exactly why they are yellowing. There can be a lot of causes for yellowing, including too little sun, too little air circulation, over or underfertilizing, over or underwatering, and the start of some fungal infections such as black spot. I would suggest you first remove all of the yellowed leaves, then plant them making sure they have full sun all day long, good air circulation, and well prepared soil. Keep the soil slightly moist like a wrung out sponge, not sopping wet. Mulch with several inches of organic mulch over the root areas. Then keep an eye on them for signs of more yellowing. If they show signs of it again, consult with your retailer or county extension to get a more complete diagnosis. Good luck with your roses!
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