Q.lilac not blooming
Last year there was a late frost and they started to bud but did not. This year there are only a few flowers.

theficuswrangler
Answered on May 16, 2014
While the most likely cause for your lilacs not flowering is the cold, both last winter and this one, there are other possibilities you might want to consider: https://www.gardeningknowhow.com/ornamental/shrubs/lilac/lilac-bush-not-blooming.htm
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