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Blooms In: July-Sept Spacing: 5-6' Exposure: Full or Part Sun Because Paniculata Hydrangeas bloom on new growth, they typically flower normally even if the twigs have been killed back by frost. Plant in a sunny, well-drained spot; some early afternoon shade is beneficial in hot southern regions. Prune in late winter or early spring. Hydrangeas are at their best in summer and fall—a quiet time for most woody plants—and are worth having for that reason alone.