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.