Pruning Hydrangeas

I always forget to prune my hydrangeas in a timely manner. Ed Hume gives the following tip about pruning these plants:

Varieties that bloom after June should be pruned during the winter. I recommend Mid-February as the ideal time to prune them. Cutting off flowers for drying, is also an excellent way to keep plants within bounds. Avoid severe pruning, as it often results in the development of lush stem (vegetative) growth and as a result, poor flowering. (http://www.humeseeds.com/efhydr.htm)