no bloom lilac

have had a lilac bush for over 10 years, but it has never bloomed.
Submitted by BHGPhotoContest

"The most common causes for lack of bloom on lilac are the following:
1. Pruning at the wrong time. Lilacs bloom on old wood. If you prune later than mid-June, you may be removing next year's flower buds.
2. Excess shade. Lilacs bloom best in full sun. If the plant is growing in a shady site, either move it to a sunnier spot or prune branches of surrounding trees to let in more light.
3. Too much nitrogen fertilizer. Excess nitrogen causes strong vegetative growth, but inhibits flowering. Use a fertilizer with a low first number in the analysis.
4. Immaturity. It can take several years for a lilac to reach blooming size. "


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