Skip to content. Not enough sunlight for lilacs to flower. Hot or humid climates that have mild Winters lilacs require a cold dormant period in Winter. Acidic soils prevent flowering. Too much fertilizer often run off from lawn fertilizer promotes foliage growth at the expense of flowers.
Drought stress. Lilac shrub is not mature enough for flowering. Late frosts can prevent lilacs flowering. Keep reading for the reasons your lilac Syringa is not blooming and how to implement the solutions, so that you lilac can bloom the following year … Note that almost all lilac varieties should bloom in late Spring. Pruning Lilac Reduces Flowering Lilacs display their flowers from old wood rather then new growth and actually flower best if left to their own devices rather then consistent annual pruning.
Not Enough Sunlight for Lilacs to Flower Lilacs require full sun 6 hours of sun or more to produce the most flowers. In deep shade the lilac is likely to flower at all and the growth is likely to be poor.
Hot Climates or Humid Conditions Prevent Lilac Flowering Lilacs are adapted to climates wit low humidity and with a seasonal cycle of temperature change throughout the year. Acidic Soils can Prevent Flowering If your lilac is not flowering this could be because of overly acidic soils.
Once the lilac has had too much fertilizer there is not much you can do to stimulate flowers this year but if you scale back the fertilizer the lilac should be able to flower the following year, If the lilac is planted in good soil and the particular shrub is relatively mature, then lilacs typically do not need much, if any additional fertilizer.
Drought Stress can Prevent Lilac from Blooming Lilacs do not flower if the soil is too wet or too dry. Late Frosts can Prevent Flowering Lilacs flower in late Spring and they try to time the emergence of their flowers after the last frost. Key Takeaways: Usually the reason for lilac not blooming is because it has been pruned to hard or at the wrong time of year.
Lilacs flower on old wood. If lilacs are pruned after Spring then this removes the developing flower buds and the lilac can not display its blooms in Spring. Lilacs require at least 6 hours of sun to stimulate flowering. If the lilac is in too much shade then this can prevent lilac from blooming. Lilacs require a period of cold dormancy to initiate flowering. If the Winter is too mild then the lilac does not flower.
Lilacs grow best in slightly acidic, neutral or alkaline soils. If the soil is too acidic, this prevents the roots from uptaking certain nutrients which results in poor growth and the lilac not flowering. Too much nitrogen in the soil from excess fertilizer or run off from lawn fertilizer results in a lilac with abundant foliage but no flowers.
Lilacs require the soil to be evenly moist. This is one of the questions most frequently asked of Master Gardeners in Ontario. The new buds form shortly after the flowers die back. Prune in spring immediately after the blooms have faded.
Cut just below the faded bloom. The bush is immature. Most varieties need a few years to grow and develop, before they produce their first blooms.
A pH imbalance or too much or too little of certain chemicals. You might want to have your soil tested. Sometimes, people use high nitrogen fertilizers, especially for their lawns, which will help produce green leaves, while hindering blooming. Where are you? Wondering if all this would help in Maine? Also, any thoughts on getting lupine started and helping our peonies? Thanks in advance!! I was given several lilac suckers at least years ago. I get blooms at most, though it has grown into a huge bush.
It is on the southwest side of the house, beside the garage, and gets plenty of sun. I even tried bonemeal. This year it has put out several suckers. So disappointed! Do not prune any others at all and see if that helps. Or move it, sometimes location makes a huge difference. Did it bloom well for the folks that gave you the suckers?
I'm Pamela, author of Flower Patch Farmhouse. Here you will find a lot of tried and true organic garden ideas and information based on my own experiences. Be sure to subscribe to my YouTube channel for beautiful garden tours! How to Grow Hardy Geraniums.
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