Thus, you should be pruning lilacs annually to maintain their form and create a balance of new flowering shoots and older stems. Your lilac also might occasionally require a more extensive "rejuvenation" pruning to revive a bush with very thick stems and minimal flowering. Prune lilacs in late spring to remove the dead flowers and broken or damaged limbs before the plant sets out its buds as it prepares for next year's blooms. patula ‘Miss Kim’), look similar to the common lilac. After three consecutive … The less drastic approach to getting an overgrown lilac back into shape is to use the third rule. If you are diligent with annual pruning of your lilac, the shrub will grow to about 8 feet tall with flowers throughout the branches. Reasons Why A Lilac Bush Is Not Blooming And How To Fix Them, Lilac Seed Propagation: Harvesting And Growing Lilac Seeds, Lilac Care - Growing And Planting Lilac Bush Plants, Indoor Holly Care: Can You Grow Holly Indoors, Natural Christmas Decorations: Homemade Garden Christmas Crafts, Living Wall Kit Info – How To Grow A Living Wall Kit, Lilac Care – Growing And Planting Lilac Bush Plants, The Benefits Of Manure Compost In Your Garden, How To Turn Green Tomatoes Red & How To Store Tomatoes In The Fall, Growing Plants Indoors: Forcing Amaryllis Blooms In Winter, Phalaenopsis Orchid: A Surprising Addition To Holiday Décor, Gifting Holiday Plants: Secret To Keeping Live Poinsettia Plants Healthy, Handmade Ornaments – Holiday Ornaments Crafted From Nature. Remove the branches by cutting just above a bud. (05/13/2008) By Bonnie. Prune In Late Spring: You must have observed that the lilac bushes bloom only on old growth. After that, you can prune them lightly or heavily. However, if left to grow and spread on their own, common lilacs will eventually only flower on the tops of the uppermost branches. Its important to know when to cut back your Lilacs, prune to late in the fall and you will loose the flower buds for next year. They will bloom less and less on wood that is older. Cut the main branch or branches of your lilac to a height of six or eight inches. Oregon State University Extension, Pruning Lilacs and Other June Gardening Tips. Syringa emodi ‘Aureovariegata’ – this Himalayan lilac is a large deciduous shrub 5m tall, with fragrant, tubular white flowers appearing from June onwards. It is a smaller variety of lilac bush that will reach a height of 6 or 7 feet. A summer with extreme weather will yield fewer flowers. Prune a third of the oldest branches all the way to the ground each year for three consecutive years. Start by taking out the thickest stems first. In order to improve air circulation or to allow more light to filter through, trimming lilacs within the inner branches may be necessary. Prune to maintain an open interior and several main branches that form a vase shape. Learn tips for creating your most beautiful (and bountiful) garden ever. By the end … If you have shaped your lilac bush to have one main stem like a tree or prefer an alternative to the three year plan, do one severe pruning in late winter. Prune them right after they have finished blooming, and before they have started budding for the next year’s show. The time to prune mature lilac plants is just after the flowers have faded in the spring. I was wondering if it is okay to prune them in the fall and, if so, how much is too much to prune back? Step 4 Cut old lilac bushes to the ground in winter; as lilacs mature, the lower portions of the plant become shaded and loose their vitality. 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