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This article was co-written by Steve Masley. Steve Masley has designed and maintained organic vegetable gardens in the San Francisco Bay Area for over 30 years. In 2007 and 2008, Steve taught Local Sustainable Agricultural Practices at Stanford University.
This article has been viewed 1,310 times.
The brightly colored and fragrant lilacs are fairly easy to grow in most regions. Whether as a shrub or small tree, lilacs need regular pruning to keep their proper shape and size. To prune your lilac, start in the spring: cut fresh flowers for a decorative bouquet, cut off the longest branches, and trim weak branches at the base of the tree. Avoid pruning the tree in the summer or fall, as this can limit plant growth.
Steps
Annual pruning
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Cut fresh flowers in spring. When the lilac flowers reach their peak and are about to fade, cutting the flowers to make a bouquet for home use can help the plant. If left on a branch, but the flower will wither but continue to suck the sap from the tree that should be reserved for new shoots to grow. So don’t regret or feel guilty about going out into the garden with pruning shears in hand to cut the most beautiful flowers – you’re doing the right thing for your plants.
- This type of pruning is also known as flower cutting. In addition to cutting flowers as soon as they are in full bloom, cut away dead flowers.
- Cut just below the calyx.
- You can disinfect your tools before pruning to avoid spreading lilac dust simply by wiping them down with a disinfectant spray or rubbing alcohol. [1] X Research Source
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Trim long branches. Observe the lilac bush and see if there are any branches that look healthy but are too long to be pruned. This can help the tree keep its beautiful shape. The process of pruning branches is also known as pruning. You can use pruning shears to cut longer branches, close to the nearest pair of side shoots.
- This means that you will trim off the branches outside the blooming part and cut to where the side shoots are growing.
- If a long branch does not have side shoots growing near the base of the tree, cut to the nearest eye or bud where new shoots will grow.
- Pruning will stimulate the lilac to sprout new, healthy, luxuriant buds near the cut.
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Prune the tree. Check for dead or diseased branches. If you find thin, brown or diseased branches in a bush or lilac, cut them close to the base. This process is called pruning, and it benefits the tree by allowing better air circulation and removing dead foliage that sucks up the plant’s nutrients.
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Do not prune the tree too late in the summer or fall. Annual tree pruning should be done during the spring (May or June in the northern hemisphere, September through October in the southern hemisphere). Pruning is a way to stimulate new shoots, and these shoots will grow throughout the year before blooming in the spring. However, if done too late in the summer, you risk cutting off these new shoots – and next spring there will be fewer blooms.
- If you prune the plant in the fall or winter, your lilac will probably not bloom at all.
Rejuvenating lilac
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Tree evaluation. If it’s an old, overgrown, or unbalanced tree, pruning to rejuvenate the tree will make it healthier and more pleasing to the eye. This type of pruning is “stronger” than the lighter annual pruning, allowing the tree to grow many new shoots.
- Inspect the plant in early spring, before the tree grows back. This is the best time of year for more intense pruning.
- You need to remember that pruning to rejuvenate the tree will lose the mature shoots that can bloom the following spring. But if you sacrifice this flowering season, you will be rewarded in the following seasons with new shoots and more beautiful flowers.
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Determine if your lilac is a graft. Some lilacs are grafted with other cultivars to produce flowers of distinctive shapes and colors. Grafted trees need extra care when pruning, as cutting below the graft will disturb the graft and alter the growth of the tree. Look at one of the lilac’s main trunks for a distinctly different spot on the bark, near a raised lump. This is probably a graft. If you don’t see this feature, your lilac is probably not grafted, and you don’t need to pay attention when pruning.
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Use pruning shears to cut the tree close to the ground. You may need to use a saw if the trunk is too large. Cut away 1/3 or 1/2 the length of each branch. The lilac will grow back, but it will take a season or two.
- If you find that your lilac is a graft, be sure not to cut below the graft.
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Prune the suckers. Root suckers are shoots that grow from the parent plant or from nearby soil. Cut these suckers close to the base of the tree or to the ground to prevent them from growing. These shoots take away nutrients from the plant. A healthy lilac bush or lilac plant should have no more than 2 or 3 large stems.
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Fertilize the tree after pruning. If your lilac has just been pruned heavily, you should fertilize the plant after pruning to restore the pH balance in the soil. You can use compost, manure, or a mixture of fertilizers around the plant to help it recover.
Advice
- If you see a flower wither earlier than the flowers on other branches, cut the dead flower before the others. This will help the plant bloom next year.
- As soon as the flowers bloom, start the pruning process by cutting a few flower stems to decorate the house.
- Hedge pruning shears are just as effective as pruning shears, but using hedge shears can make the tree unattractive by being over-trimmed.
Warning
- Do not remove too many branches. A general rule of thumb is to cut off about a third of the branches and keep a balance in removing old and new branches. Old branches will give flowers, so you should keep plenty of branches around. However, pruning all new branches will result in the plant not blooming in the future.
Things you need
- Tree pruning scissors
- Small garden saw or hand saw
- Garden Gloves
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This article was co-written by Steve Masley. Steve Masley has designed and maintained organic vegetable gardens in the San Francisco Bay Area for over 30 years. In 2007 and 2008, Steve taught Local Sustainable Agricultural Practices at Stanford University.
This article has been viewed 1,310 times.
The brightly colored and fragrant lilacs are fairly easy to grow in most regions. Whether as a shrub or small tree, lilacs need regular pruning to keep their proper shape and size. To prune your lilac, start in the spring: cut fresh flowers for a decorative bouquet, cut off the longest branches, and trim weak branches at the base of the tree. Avoid pruning the tree in the summer or fall, as this can limit plant growth.
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