I'm thoroughly inexperienced with roses! I have 3 miniature roses growing in pots, because there is no area in my yard that has proper drainage and sun for them. They seem to be doing fine, except they've picked up some kind of bug. (Sorry my camera battery is dead!) I'm pretty sure it's some kind of mite, and I plan to spray them with Safer Soap tomorrow -- supposed to rain today.
The one I got last year is in an 8-inch pot and doing really well. I put the 2 I got this spring into 6-inch pots. I chose smaller pots for the new ones, because when I transplanted the one last year into the 8-inch pot, it promptly stopped growing and didn't bloom until the fall. The ones in the smaller pots dry out amazingly fast! Should they be in larger containers?