Hmm, could be a number of things. First, it could be "wet feet" (over watering or poor drainage in the soil). If water collects around their roots, it will eventually kill the
plant. It could possibly be too much nitrogen. I mean, yes this stuff does help with new growth, but
roses aren't really acid lovers, and too much will burn the roots of ANY
plant. How about their sunlight? Are they in sun, shade, or partial?
roses, once they have roots need sun, as most are sun lovers and require several hours a day of sunlight. Perhaps they have been over fed. Or, last but not least, they could be in shock. There's a lot of things that can go wrong with
roses.