Answer: Hydrangea paniculata 'Kyushu' will grow 15'-25' in height by 10'-20' wide. It's probably the most cold hardy hydrangea species (zones 3-8) and should survive your winters without special care. You can expect your plant to produce flowers from mid-July on through to first frost. Depending upon how old your plant is, it may bloom next year. If not, it will bloom the following year. Hydrangeas produce flowers on shoots that develop in the spring from older wood. Pruning should be done after the plant finishes producing flowers. When you prune, cut back the stems only part-way to allow buds to remain on the lower portion of the stem. The following spring new flowering shoots will develop from below the cut. To keep the plant within bounds, cut some of the stems all the way to the ground.
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