The general advice for inducing plants to bloom is to apply phosphorus to the soil. But there is another "trick" you can try to speed up flowering on lilacs:
- Fill a bucket with a gallon of water, and stir 2 oz. of Epsom salts into it.
- Then pour this solution onto your lilacs when they are in a period of dormancy (which occurs from late fall to early spring).
But mainly, you just have to wait. I waited 5 years for a "sucker" to bloom that I transplanted from an old stand of lilacs. At the end of the 5-year wait, I was finally rewarded with blooms, without doing anything specific to get it to bloom -- I just waited.
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