I'm wondering if your miniatures are getting enough sun? They need at least 6 hours a day just like larger roses. I would make sure it has good drainage because miniatures like moist soil, but don't handle real wet soil and poor drainage well. I would give it some time because miniatures are on there own roots so it will probably come back. I have mine in large pots and mix peat and perlite in the soil when I pot them, top the soil with moss, then I fertilize them with a water soluble fertilizer every two weeks and they do great. Hope this helps!