Posted: 03/11/2013 at 18:18
Not an answer to your question, but does it matter?
I've just cut all the leaves from all 3 of my helibores (one is a Christmas Rose). There will be very few new leaves grow over the winter and when the flowers come in spring they stand proud above whatever new leaves there are, then the leaves grow over the summer. Hope I do the right thing with them but it seems to work ok for me. Mags