To propagate a lilac you already like, establish where the new plant material comes from. A sucker from an own-root common lilac can carry the traits of that cultivar. An almost identical-looking shoot beside a grafted shrub can come from its rootstock. If the rootstock is uncertain, choose a low branch or softwood shoot from the part of the crown you know flowers true to type. Seed is an option for growing a new lilac when matching the parent is unimportant.
Work out what the new shoot belongs to
Look for the original nursery label or ask the grower about the propagation method. If you have no label, inspect the base of the older stems. A distinct bend, swelling or change in bark can indicate a graft union, but a mature shrub does not always offer a clear clue. A shoot can emerge close to a named lilac and still belong to the rootstock underneath it. What matters is the point of origin, rather than how impressive the shoot looks above ground.
If you need to preserve a named variety from a grafted plant, choose a branch from the flowering part of its crown. Mark that branch while the flowers make it easy to recognise. This is useful in a mature garden where lilacs have grown together or the parent bush has several stems. Do not lift a shoot from a neighbour's clump until you have confirmed which parent it belongs to and arranged a place to plant it.
Separate a rooted sucker from an own-root lilac
Choose a sucker with enough space to inspect its base without disturbing several neighbouring stems. Ease the soil away and follow the connection to the parent. You need fine roots on the sucker itself. A tall stem with large leaves can look ready to transplant while it is still drawing water from the parent plant. If the fine roots are sparse, leave it to develop and choose another candidate.
- Prepare the new planting position or a small nursery bed before lifting. Exposed roots can dry out while you are still digging the new hole.
- Loosen the soil around the sucker, preserve its fine roots and cut the connecting root with a clean tool only when you can lift it with roots attached.
- Set the shoot at approximately its previous depth. Backfill, firm gently and water it in where the soil can drain freely.
- Label the young plant with the name and source of the parent. Several small lilacs can be hard to distinguish before they flower.
Choose a cool spell when the ground is workable. The best window can differ even across one village. A low, sheltered patch may remain sticky long after soil on a slight slope is ready. On an exposed plot that dries in the wind, line up a way to water before taking the plant out of the ground. If you cannot give the young plant that follow-up care, leave it attached until conditions suit the move.
Layer a flexible branch while it remains attached
Ground layering lets the branch remain connected to its parent while roots develop. Select a healthy shoot that can reach the soil without a sharp bend. Make a shallow trench, secure the middle of the shoot in it and cover that section with soil. Keep the tip above the surface. If the branch keeps springing free, adjust where it is pinned or pick a more flexible shoot instead of forcing it.
Keep the buried section from drying out. After a suitable interval, ease soil away at the side and look for roots without pulling up the branch. Green leaves can survive while the stem is still supplied by the parent, so leaves are a poor test on their own. Wait until there are enough roots to sustain an independent plant before cutting the connection. Move the young lilac with as much of its rooted soil as practical.
Do not assume a layer will be ready by a certain date. If the receiving bed has already been prepared but the layer still has few roots, leave it connected where possible. You can also keep that bed for a separate rooted sucker. Mark the pinned area so a helper does not dislodge it while removing weeds or adding mulch.
Take softwood cuttings if suitable branches are out of reach
Cuttings are useful when the branch you want cannot be bent down to the ground. Use fresh young growth while it is still flexible, rather than a fully woody stem from the end of the season. Start with a draining pot, clean loose propagation mix and a position with bright indirect light. Keep the cut shoots from drying out between taking and preparing them. Clean tools and a healthy parent give you a sound starting point.
Remove the leaves from the part of each stem that goes into the mix. Aim for humid air around the leaves and an evenly moist rooting medium without standing water. If using a clear cover, keep it out of strong direct sun and check for overheating. Cultivars can differ in how readily they root. Take a few cuttings if the size and health of the parent allow, while leaving its main branches intact.
Once rooted, let young cuttings adapt gradually to ordinary air and light. Leaf growth alone does not tell you that a cutting is ready to face hot wind in the garden. Check whether roots have formed and whether the small root ball holds together. If the plant is still small at the approach of cold weather, use a suitable protected growing-on position rather than moving it to the most exposed part of the plot.
Choose a permanent spot and watch the first growth
Give common lilac a well-lit site with soil that drains. In a garden with heavy ground, inspect the proposed spot after rain. A hollow that holds water is a poor place for a small root system. In fast-draining soil, check moisture at root depth instead of judging the surface. Nearby grass can look fresh while the soil around the new lilac is already drying out.
Consider the mature width of the cultivar before selecting a position by a path or fence. Read our lilac flowering and care guide if you want to compare flowering habits while deciding where the shrub will be visible. Keep enough space to reach the plant for watering and to work around it without hitting it with a mower. In a hot period, prepare water and keep the roots shaded until planting, or wait for a more manageable spell.
If a young lilac wilts, check the root area first. Think about whether the root ball dried out before planting, whether soil is wet below the surface and whether the roots were disturbed. Adjust the part of the care that is causing the problem. Check the condition of new shoots and leaves as the plant settles, and make any fertilizer decision separately.
If the young plant needs time in a nursery bed, use the advice on planting lilac when you are ready to choose its permanent position and move it without breaking up the rooted soil.
Feeding a lilac after establishment
Complex fertilizer universal granular
These universal granules include a direction for deciduous trees and shrubs. This is the applicable group for an established lilac.
Consider the product only if feeding is needed. Read the full instructions, then compare pack sizes against the area you intend to treat.
Questions about propagating lilac
A sucker from a confirmed own-root cultivar retains its variety traits. A sucker from a grafted plant's rootstock has that rootstock's traits instead. A correctly propagated young shrub still needs time to establish. Avoid judging its flowering from its first growing season.
Fully woody cuttings are unreliable for lilacs. If the suitable young growth has passed, wait for a new flush of soft growth or use a different method suited to your shrub. An already rooted sucker on an own-root plant is a more straightforward prospect if the ground and weather suit lifting it.
It can be an interesting way to raise a plant when you are happy to see different traits. Vegetative propagation is the choice when you want the named cultivar. If you need a plant for a certain spot soon, a clearly labelled nursery shrub lets you plan around its known size and ask how it was propagated.
Decide whether feeding is needed after the shrub has rooted. For a product measured by area, check the label group and measure the area you intend to treat. Assess other shrubs separately before adding the amounts together. Buy a pack that covers that measured work and store any surplus as directed.
