Most of the time that something doesn’t flower it’s for one of three reasons: Too little light (did overhanging trees grow and cast more shade than before?); too much Nitrogen (did the adjacent lawn get nuked a lot or did you feed the bed a lot of N, which causes good green growth but limits bloom); or improperly timed pruning (pruning late summer through winter will sacrifice some of the coming spring’s bloom because it removes dormant flower buds).
Any of these sound possible?
Another reason is too much heat — in hottest zones lilacs will fail to bloom; I don’t know where you are located.
located on Ct/Mass line, so certainly not too much heat.
And there is no tree that could have cast more shade — so perhaps nitrogen???
Doesn’t seem likely as I don’t recall doing anything like that. But I will certainly keep it in mind for next season.
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.