Pruned at the wrong time of year and cut off flower buds.Don't apply lawn fertilizers (high in nitrogen) around the base of lilacs. Too much nitrogen fertilizer is being applied, causing the plant to put energy into growing leaves, not flowers.If the lilac has become shaded by another plant over time, consider pruning the other plant. Make sure your lilac has 6 or more hours of full sun per day. Plants are not receiving enough sunlight.Be patient and continue to care for your lilac. Some blooming may begin in years 2 and 3. After planting, a lilac’s energy reserves will be used for developing a strong root system rather than flowers or leaves. Bacterial blight is more common in cool, wet weather.Lilac borer is the larvae of the clearwing wasp.Powdery mildew is common and cosmetic only choose disease-resistant cultivars.The plant may not bloom or sparsely bloom for 1 or 2 years.New growth will grow from the root area in spring.In late winter, use a saw or hedge trimmer to cut the entire plant to the ground.Rejuvenation pruning is a technique for smaller, densely-branched lilacs like Korean or Meyer lilacs ( Syringa meyeri) that have become overgrown.Do this every year until all large stems are removed.Use a lopper or hand saw to remove a third of the thickest stems at the base.Years later, lilac stems can grow very large and tree-like and they will tend to shade out new growth at the plant base. Newly planted lilacs usually do not need pruning for 2 to 3 years and it will take 1 or 2 years before a lilac blooms. Renewal pruning: Renewal pruning allows more light throughout an older plant and encourages new stems to grow and flower.Shear lightly, taking off only the dead flower heads. Deadhead: Use a hand pruner to cut off dead flower heads down to a pair of leaves, or use a hedge trimmer for larger plantings.Lilacs should be deadheaded immediately after blooming to encourage good bud development and flowering the following spring. Like other spring blooming shrubs, lilacs develop flower buds for the next year after blooming during the current year. This video (28:44) gives selection, planting and growing information.Poor drainage can result in stunted growth, fewer flowers and root rot. ![]() Water after planting. Make sure the soil drains easily and does not pool.Avoid applying lawn fertilizers near or around lilacs as the high nitrogen content will increase leaf production and decrease flower production.Once the lilac is established (2 to 3 years after planting), fertilize every few years with an all-purpose shrub fertilizer.Proper spacing increases air circulation and reduces powdery mildew.Planted too close, lilacs will require more pruning and will reduce bloom.Have your soil tested by the U of M Soil Testing Lab. Moist, well-drained soil avoid wet soils with poor drainage.Full sun (6+ hours) less sun reduces flowering and increases powdery mildew.Hardiness zone: 3 to 7 depending on the species.xhyacinthiflora 'Pocahontas' Growing lilacs
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