Answer: This isn't uncommon for young lilacs. Until a lilac is well established (7 - 10 years), it's advisable to remove the spent flowers from the shoots. This helps the plant to set new flower buds for the coming year. It's best to do this as soon as the shrub is done blooming so the plant has plenty of time to develop flower buds. Some gardeners find this problem is a result of overfertilization. If your lilac is in a lawn where you apply regular doses of nitrogen, this can inhibit flower formation. Lilacs need very little supplemental fertilizer. A rich compost mulch applied in spring is the most all lilacs need to thrive. I hope this helps!
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