When lilacs finish blooming, what stands beside them decides how the border looks for the rest of the season. Good neighbors share the lilac’s love of sun and sharp drainage, and they stay out of its roots.
What Should You Plant Around Lilacs?
Pick companions that match the lilac’s light and drainage; in North Carolina, Manchurian lilac prefers soil near neutral. Lilacs flower best with at least 4 to 6 hours of sun a day in Iowa, so a companion that needs shade or constant moisture belongs somewhere else.
Sun-loving perennials and bulbs fit the bill. Daffodils and other spring bulbs cover the ground while the shrub is still bare, and catmint, salvia, peonies and ornamental onions carry color after the lilac fades. In Indiana, choose companions rated for your zone so winter damage does not leave a gap.
Type of lilac and climate change the answer in small ways. A tall shrub needs more room around it than a compact one, and a cold-winter yard limits the perennial list. In Oregon, Ceanothus, called California lilac, is not a true lilac and fixes its own nitrogen.
From the almanac
Lilacs in your state
The dates on this page depend on where you live. Your state's page carries its frost dates, its USDA zones and the year laid out month by month.
Northeast
Southeast
- Alabama
- Arkansas
- Delaware
- Florida
- Georgia
- Kentucky
- Louisiana
- Maryland
- Mississippi
- North Carolina
- South Carolina
- Tennessee
- Virginia
- West Virginia
Midwest
Southwest
West
Pacific Northwest
Canada
How Do You Plant Companions Around a Lilac?
Work from the shrub outward, because the lilac’s size and roots set the limits for everything else.
- Watch the spot through the day and confirm it gets at least 6 hours of direct sun, so that the lilac and its companions all bloom well.
- Leave the lilac its full spacing before adding anything, since specimen shrubs in Iowa and Montana are set 10 to 15 feet apart and need that air around them.
- In Montana, plant lilacs at least five feet from buildings because their roots can damage foundations over time.
- Plant companions in the open ground beyond the drip line, so that you never cut through the shrub’s feeding roots while digging.
- In Iowa, spread a 2- to 3-inch layer of mulch around each lilac to conserve soil moisture and control weeds.
- In Iowa, water lilacs during drought periods.
In Indiana, choose plants that suit your zone before you buy.
Does the Type of Lilac Change What You Plant Beside It?
It does, mostly through size and spacing. A lilac grown as a lone specimen leaves wide open ground for a perennial bed, while one grown as a hedge leaves almost no room between plants.
Soil and light tolerance also vary a little by type. Companions have to fit the space the shrub leaves, so read the row for your lilac before you draw the bed.
| What changes | Why it matters |
|---|---|
| Common lilac as a specimen: 10 to 15 feet apart in Iowa and Montana, 12 feet in Ohio | Wide gaps leave room for a mixed bed of perennials and bulbs between shrubs |
| Common lilac as a hedge: 8 feet apart in Ohio, 5 to 8 feet in Iowa | Tight spacing leaves little planting room, so companions go in front of the row |
| Montana hedges: 18 to 24 inches on center for a three- to four-foot hedge, two to three feet on center for a six- to eight-foot hedge | Closely planted hedges form a solid wall, so low plants sit in front and not between |
| Late lilac: planted in spring, 3 to 5 feet apart | It is a tall shrub on a close spacing, so keep taller companions at a distance |
| Manchurian lilac: tolerates some shade, prefers soil near pH 7.0 (North Carolina) | Neighbors that suit neutral soil and a little shade are an easier match for this type |
For most homeowners the takeaway is simple. Set the lilac’s spacing first, then fill what is left. In Florida, lilacs are spaced 36 to 60 inches apart, so check locally for the spacing that fits your variety.
What Mistakes Should You Avoid When Planting Around Lilacs?
Crowding the Trunk
A bed packed tight against the shrub looks full for a season, then the lilac loses air and light. Roots also struggle for room. Pull new plants back to the drip line and let the shrub keep its own ground.
Planting Thirsty Beds Underneath
Moisture-loving plants bring frequent watering, and lilacs do poorly when soil stays soggy. In North Carolina, Manchurian lilac prefers reasonably fertile, well-drained ground that never becomes waterlogged. Choose companions that like well-drained soil, and do not leave the ground soggy.
Shading the Shrub
Tall or fast-growing neighbors can slowly take the light away from the lilac. Fewer flowers follow, and the shrub is more prone to disease on damp, shaded leaves. Keep tall plants to the north of the lilac, and keep the sunny side open.
When Should You Plant Around Lilacs?
Plant late lilac in spring; for other plants, use the planting window recommended for your climate.
- Planting months vary by climate, so confirm the right window for your area before buying plants.
Common Questions
Can You Plant Under a Lilac?
Only at the edges. Low, drought-tolerant plants can sit at the outer reach of the branches, but the ground right beneath the shrub is best left mulched and undisturbed.
Is California Lilac a True Lilac?
No. Ceanothus is a different plant that earns its common name from similar spring flowers. In Oregon, it fixes its own nitrogen and does not require nitrogen fertilizer.
Do Lilacs Mind Wind and Reflected Heat?
Yes. In Montana, avoid windswept spots and warm areas beside light-colored buildings, where buds can be killed or forced early. Place the lilac and its companions away from those corners.