Pruning obedient plant
Advice for October in the Netherlands
Obedient plant flowers on new stems in summer and late summer. Routine trimming means removing dead old stems; shortening the whole clump during flowering is unnecessary. Months are guidelines for the Netherlands and Belgium; also assess growth, flowering and the weather forecast.
Obedient plant — October
Light trim only
Only when an entire spike has finished may you cut it above a healthy leaf pair. A spike may still carry flowers at its tip; let those finish first.
Pay attention to this
- Check the tip of each spike before cutting.
- Pruning does not stop spread through rhizomes.
- Support floppy flowering stems instead of mowing everything down.
Frequently asked questions
- When should I tidy obedient plant?
- In winter or early spring once old stems are dead. February and March are practical guide months.
- Why is obedient plant escaping its space?
- Physostegia virginiana forms rhizomes. Cutting above-ground stems alone does not contain that growth.
- Why is a spike brown below but fresh at the top?
- Flowers open from the bottom upward. Wait until the whole spike has finished.