Hydrangea flowers tend to be on the heavy side, so.

pruning hydrangea shrub Mar 25, Let these plants grow a season or two before doing any serious"hard" pruning.

Once the shrub is established and has a couple of growing seasons under its belt, prune these hydrangeas in the spring down to the ground, or not at all if you want a larger shrub. Flower buds will grow on this season’s growth or new wood. Aug 15, While plants that bloom on new wood can be pruned to the ground each fall and will emerge in the spring with new blooms, when done repeatedly, this behavior can cause the plant to slowly weaken.

And those that bloom on new wood should be pruned before new growth begins in spring.

When to Trim Hydrangeas. To prune your shrubs, all you need is a good pair of sharpened shears or bypass pruners.