"Climbing Geraniums" - cut them back?
Last summer I bought some "climbing geraniums" from the garden centre, and they were great. They were about 3 foot high when I bought them, and they grew to 4 or 5 feet high supported by obelisks outside our front door. In late autumn I brought them into the greenhouse - at that stage I had to cut them back to about 2 foot or they wouldn't have fit on the shelves. They have flowered all winter, even though they've had no water or attention!
I have read somewhere that I should cut my geraniums back hard at this time of year to encourage growth from the bottom. Does this apply also to these "climbing" varieties? I want to re-create last summer's five-foot displays, and so I don't want to cut them back so hard that they don't grow to that height again.
Also, is it time to start watering them yet?