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What It Means If Your Lilac Plants Rebloom During Fall
By JANELLE WARD
Lilacs may bloom again during the fall if the weather and rain conditions in your area force the plants to enter a second dormancy period during the summer.
Lilac plants enter a period of dormancy during the winter to prepare to bloom, but in some climates, summers are becoming too sweltering for the plants to remain "awake."
This causes the plants to instinctually enter an additional state of dormancy during the summer, and once it cools down in the fall, lilacs wrap up their dormancy period and bloom.
While this phenomenon isn't unusual, this second blooming can have negative effects on your plants, causing them to produce fewer blooms during the next spring season.
Although factors like exposure to disease or poor pruning habits can be controlled, others are simply unavoidable, like the consistently rising temperatures across
the globe.