Trees, Shrubs and Conifers: Lilac care and maintenance, Advice needed, 0 by rothdavid

rothdavid wrote:
I bought a home in Central PA last year, there is a large lilac bush along the retaining wall. It's been there forever. For the most part, it looks fairly heathly but is wild and out of control. Lots of lilac undergrowth, runners, new baby plants popping up in the yard.

I'd like some advice on care and maintenance, pruning? When, How? There are several OLDER larger trunks, should they be removed and allow the undergrowth to come up? Should I clear the majority of the undergrowth out and leave the larger, older trunks?

Any advice would be greatly appreciated.

Thanks

Pic is from last September, it rebloomed, producing these two small flowers!