I got a pot of Mini roses for Valentines Day from hubby. I put them in a bigger terra-cotta pot,there are 6 in the pot. After some trial and error they have been blooming like mad. When should I expect them to go dormant or should I force it? It is getting cooler here in the Mid-West so I cant keep them out side on their stand. When I keep then in they get yellow spotty leaves. Any ideas would be greatly appreciated .