Pruning of penstamon
North Yorkshire, United Kingdom
Three years ago I obtained a mature penstamon ( dug out of a deceased relative's garden during house clearance). I simply transplanted it to a sunny spot in my garden during the autumn and have not touched it since. It is a mass of bright red colour from summer right through to late autumn, but it is now getting very leggy and I want to prune it to promote more sturdy growth. How hard should I prune and when is the best time?
- 12 Jan, 2009