How do you trim hydrangeas and get new flowers?

To trim hydrangeas and encourage new flowers, it's essential to know the type of hydrangea you have. For those that bloom on old wood (like bigleaf and oakleaf hydrangeas), prune right after flowering in late summer. For those that bloom on new wood (like panicle and smooth hydrangeas), prune in late winter or early spring before new growth begins. Always remove dead or weak stems and shape the plant to promote good air circulation and healthy blooms.