Knockout roses, on the other hand, can grow quite large if left unpruned. "They do need pruning to maintain their shape," Reeve advises. "If they get too big, you might need to trim them again in ...

With spring just around the corner, now is the time for ... "The first pruning of the year should bring roses down to about 18 to 24 inches," said Wilson. "For roses like knockout varieties ...