Dahlia help - keep indoor a bit longer or move to cold frame?
A dahlia beginner, among many other plants, I potted up a recent order and they are doing very well in the bathroom. However there is only a skylight and I worry they'll grow leggy, so is it safe to move them to a cold frame? I do not have a green house, but shelving with a heavy duty growhouse cover. I live in south west London (for USD purposes)