Answer: Unless the plant is overgrown, there's no need to prune your holly. If the center of the shrub is bare, you can prune back the branches to force new growth on the inside of the plant, but routine pruning is unneccessary. Climbing hydrangeas can and should be pruned to maintain size. Cut away any stems that have flowered, and leave those that have not yet flowered. Early spring is a good time to renovate overgrown climbing hydrangeas. To promote flowering, cut some of the stems down to the ground and leave some of the stems uncut. Continue to prune throughout the growing season to reduce plant size and remove old, dead stems.
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