My lilac is 12' tall and I would like to prune it so I can reach the blooms. How and when is the best time to do this?
Multnomah County Oregon
Thank you for your question about pruning your lilac. Two rules about pruning these plants: in the spring and only a third of it at a time. This Extension article explains: http://extension.oregonstate.edu/gardening/prune-lilacs-soon-after-bloom The timimg rule applies to rhododendrons as well, since they have been putting on buds all summer. Hope this is helpful. Good luck!