by gardening_guru » 04 May 2008 19:12
Hello Lesley,
I would wait until those young leaves have changed colour and prune then when you won't miss the stunning red foliage. Remove any branches that are obviously leafless or dead, any branches that are crossing. Then stand back and select branches that could be removed to improve the shape. Normally Pieris 'Forest Flame' do not require any pruning, but I see nothing wrong with removing a few branches (I would suggest a maximum of 10% in any one year) to improve the shape.
Also, is it growing in a pot or the open soil? Does it need re-potting to improve it's vigour?
George aka The Gardening Guru