Why doesn't my lilac bloom well?
"If your lilac bush/tree is quite old, it may need rejuvenation to spur more bloom. Lilacs bloom best on wood that is a couple of years old. If this is an old shrub, it may have a lot of much older wood. Consider cutting out some of the oldest stems back to ground level. If you remove 1/3 or 1/4 of the oldest stems each year for 3 or 4 years, you'll have a completely rejuvenated shrub by the end of 4 years. The best time to remove the old stems is in late winter. You can also do a more drastic renewal by cutting off all stems in late winter. However, it will take several years for the shrub to return to blooming size if you do this.
Another consideration: Is your lilac in full sun? It will bloom best in full sun. If not, try thinning out branches of some of the trees that are shading it."
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