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How to Prune Perennials
Tips
A perennial is a plant that blooms more than 2 years.
Dead heading means removing spent blooms.
Trim the plant back a little to promote new spring growth.
Trimmings with roots still attached can be started as new plants.
Clean dead leaves from underneath the ground plants.
The best place to cut is above nodes where new leaves and shoots will emerge.
The cut should have a green color in the shoot. If it reveals a brown shoot interior, that part of the plant is dead. You will need to cut until you find green.
Many perennials benefit from the complete removal of old growth.