There are so many varieties of phlox that it is not possible to give a uniform care or cut recommendation for all varieties. Depending on the flowering time and growth habit, cut back your phlox in spring or autumn.
Always cut off faded inflorescences immediately
Annual phlox flowers do not require pruning. Perennials, on the other hand, benefit from regular pruning. For example, the ground-covering varieties form a denser and more even carpet when cut, and early-flowering varieties may flower again.
The fall cut
For early-blooming phloxel varieties, I recommend pruning in the fall after the plants have finished flowering. Cut the perennial about a hand's breadth above the ground. If seeds have already formed, collect them before cutting. They usually germinate without any problems, even if they are only loosely scattered in the flower bed.
In addition to regular pruning, you should of course cut off withered and/or faded parts of the plant throughout the year. Not only does this look nicer, but it also helps your phlox stay healthy.
Cut back in spring
If your phlox doesn't flower until late summer or well into fall, don't prune it until next spring. It has enough time to recover and sprout again before the next flowering. So your plant also has good winter protection.
Extend the flowering period with clever pruning
As a rule, the buds and flowers of the phlox are all formed at the same time. It looks beautiful, but unfortunately the flowering period is relatively short. Extend the flowering period by cutting back part of the flower stalks by about one to two thirds before the buds form. They will sprout again and will flower later.
You should note that:
- Prune early flowering varieties in fall
- Cut back late flowering varieties in spring
- about a hand’s breadth above the ground
- targeted pruning can extend the flowering period
tips and tricks
Early flowering varieties of phlox are best pruned in autumn, late flowering varieties next spring.