Posted: 15/08/2015 at 12:20
Would have said pretty much as Claudia did.....viz. thst it is a "tricky" one.
i treat this pretty much as I do a broom......i.e. Buy when young and lightly tip back as soon as flowers are going over. As small plants, even before they flower, I pinch them back. Then the plant is kept just that much smaller.
here it is a fast growing plant and if it is left too long pruning is difficult. I have successfully cut back into old wood but for me the flowering is never as good . An expendable plant for me esp when hard pruning becomes necessary.