Answer: Rhododendrons develop flower buds during the summer months which will open next spring so pruning as soon as possible after it has flowered in the spring will give it plenty of time to grow and form flower buds for next year. You can prune up to one third of the live growth in any one pruning session. If you need to prune it back more, wait until next year to reduce its size even more. Prune each stem or branch back to a leaf node and cut it on an angle so water doesn't have a place to sit and cause problems. Good luck with your landscape!
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