"How should I trim overgrown lilacs?" is a common question. When lilacs seem to be petering out, there's a 3-step (over 3 years) procedure for rejuvenating lilacs that the experts recommend:
- Take a rough count of the total lilac branches coming out of the ground.
- Mark the oldest-looking ones, until you've reached a count of about 1/3 of the total branches.
- Trim those older lilac branches down to the ground. That concludes your rejuvenation work in the first year (step 1).
- In years 2 and 3, simply repeat the above. The end result will be more energy being channelled into the younger lilac branches coming out of the ground.
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