Posted: 19/10/2013 at 17:54
I've never pruned twisted hazel, it's usually slow growing and I think that pruning it can destroy the beauty of its form. All I've ever needed to do is cut out any straight stems coming from below the graft.
Yours is obviously very happy now it's got it's feet in the soil. A nice bushy Corylus contorta will look fabulous in the winter. They can look a little congested in the summer, but we don't grow them for their foliage do we?
I don't think I'd worry about leaves turning black at this time of year - they'll be falling off any tme now.