When I have bought their roses in containers in the past......usually in May or later so they have been planted in the container about 3 months......they are around 3 feet high and in bloom. I pick out what I think are pretty ones. They put on some growth the first summer. The next spring I try to prune lightly so the plant can really become established. The next spring I prune a little heavier. I get the most winter kill if it turns cold suddenly in late fall, before the roses are completely dormant. It did that this year. Mine look black now and I think I will have to do some heavy pruning. My main concern with roses in containers is if the root system isn't established and the soil falls away when I am planting.
