Best practice is to prune back stems that have just finished flowering to about 20 cm from the ground, leaving young new shoots to develop and flower later in the season or the next spring. Life in full bloom. Bigleaf hydrangeas (Hydrangea macrophylla) set flower buds on old wood, which develop in late summer and fall; therefore, pruning should be done immediately after flowering. Be sure to remove only a third of the total growth of the plant.
The cultivars in the Endless. Oct 30, Pruning Do’s and Don’ts. DO: Take care to prune the flowers of the endless summer hydrangea during the summer months. DO: Cut one or two of. Endless Summer hydrangea macrophylla require very little pruning day-to-day, so you are able to simply enjoy the beautiful plants.
These perennial hydrangeas bloom on growth from the current year as well as previous years, which allows for the re-blooming throughout the summer.
If you prune too much, you will be removing potential blooms. Most of the other hydrangeas should be pruned in summer, once they have finished blooming. Most of these bloom on what's called"old wood" - growth from the year before. If you prune them in early spring, you risk cuting off the dormant flower buds. By pruning right after the blooms have faded, you allow the plant time to set buds for the next year.
Prune these hydrangeas only in the summer before August (to be safe). Some experts believe these hydrangeas may be pruned even into August, but this might be risky.
The hydrangeas may already have set their bloom buds for the next year. Aug 20, Prune the hydrangea to reduce its size. If your hydrangea has grown quite large, you can prune it in June or July (just after the blooming season) to contain it a bit. Trim back the branches by 1/3 to the nearest shrubnotch.buzz: K. Feb 10, The process of training a panicle hydrangea into a tree starts when the shrub is young. This is usually done by the grower or nursery, rather than by the home gardener – you can buy tree-form shrubs from the nursery.
Once the tree shape is established, pruning must be done regularly to maintain the proper shape.