how to push new growth from bottom of lilac stem

6 months ago

I have a lilac on a standard in a flower bed... likely 10- 15 years old and I prune it back every year to about the same size.

Problem is several of the main branches from the graft on one side have died and left the top with a big empty area. How can I encourage growth from the bottom of the remaining heathy stems so that it will fill in the big gap.

Btw, I am in SW Ontario

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