Illustration
Lilac
Syringa vulgaris
Lilac blooms from May through May.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Lilac
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 3–7. Expect it to reach about 10 ft tall and 8 ft wide at maturity, in roughly 4 years (a house reading).
Pets
- Not yet checked for pets.
Lists differ and none is complete. If a pet eats a plant and seems unwell, call a veterinarian or a pet poison helpline.
What was checked
Nine facts were checked against named botanical sources, each recorded beside the sources that carried it: mature height and spread, hardiness zones, sun, water, bloom months and color, the trait tags, and years to mature size, which rests on a recorded house rule where no publisher states one and is marked so. Soil, diseases, pests, toxicity and the plant's own names have not yet been read for this plant, and its trait tags are the ones a feature uses rather than every word a page prints. Each fact above carries its own mark. The planting, spacing and size sections are derived from these checked facts by a fixed rule, not checked separately, and the plant type is the library's own classification.
When to plant Lilac
Plant Lilac in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. In zone 5, the middle of its hardy zones 3 to 7, spring means April to June and fall means August or September. Once settled, it blooms in May.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 5, the middle of this plant's hardy range, start with zone 5 in April. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Lilac get?
10 fttall5 ft 7 inan adult8 ftwideSee Lilac in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
How far apart to plant Lilac
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Give Lilac about 8 ft of clear ground in every direction, measured from its center. It is one plant with room around it, not a row, and a raised bed is too small for it.
Add Lilac to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
Where these facts come from
Lilac's height, spread, hardiness zones, sun, water, bloom months and color and trait tags were checked against 14 published sources on October 29, 2026. Each one is linked below with every fact it carried, which can include a fact this page still marks as not yet checked, because a source carrying a value is not the same as the value being held to the standard. Facts not in that list, and the planting, spacing and size sections, are not covered by these sources.
- Missouri Botanical Gardenheight, spread, hardiness zones, sun, water, bloom months and color and trait tags
- trees.umn.eduUniversity of Minnesota Urban Forestry Outreach and Research, tree and...height, spread, hardiness zones, sun, bloom months and color and trait tags
- NC State ExtensionSyringa vulgarisheight, spread, hardiness zones, sun, water and trait tags
- woodyplants.cals.cornell.eduCornell University Woody Plants Databaseheight, spread, hardiness zones, water and bloom months and color
- Missouri Botanical GardenSyringa vulgarisheight, spread, hardiness zones, sun and trait tags
- Purdue ArboretumSyringa vulgarisheight, spread, hardiness zones, sun and trait tags
- University of Illinois ExtensionSyringa vulgaris, Common Lilacheight, spread, hardiness zones, sun and trait tags
- Iowa State University Extensionand Outreachheight, spread and bloom months and color
- Oregon State UniversitySyringa vulgarisheight, hardiness zones, sun and trait tags
- University of Illinois Extensionheight, spread, hardiness zones and water
- brownsnursery.comBrown's Nurseryheight, spread and trait tags
- Chicago Botanic Gardenhardiness zones and bloom months and color
- RHSRoyal Horticultural Societyheight, spread and trait tags
- Chicago Botanic Gardenheight and trait tags
How the checking works, and what each standard covers, is on the verified plants page.
Comes in 19 varieties across 5 colors
Same genus, similar care - pick the color you are growing.
Across the group, bloom runs from April through October: Beauty of Moscow opens first (April) and Bloomerang Purpink Reblooming Lilac is the last to finish (October).
- Baby Kim
- Beauty of Moscow
- Betsy Ross
- Bloomerang Ballet Reblooming
- Bloomerang Dark Purple
- Bloomerang Purpink Reblooming
- Bloomerang Purple
- Bloomerang Showmound
- Charles Joly
- Katherine Havemeyer
- Ludwig Späth
- Madame Lemoine
- Miss Kim
- President Grevy
- President Lincoln
- Primrose
- Sensation
- Wedgwood Blue
- Yankee Doodle
Compare every variety in the Lilac group
Every figure is the variety's own page fact. Tap a name to open it.
| Variety | Color | Blooms | Hardiness | Sun | Size (H × W) |
|---|---|---|---|---|---|
| Baby Kim | Purple | May | Zones 3–7 | Full sun | 2.5 ft × 2.5 ft |
| Beauty of Moscow | White | Apr–May | Zones 3–7 | Full sun | 10 ft × 7 ft |
| Betsy Ross | White | Apr | Zones 5–8 | Full sun | 9.5 ft × 11 ft |
| Bloomerang Ballet Reblooming | Pink | May–Sep | Zones 3–7 | Full sun | 4 ft × 4 ft |
| Bloomerang Dark Purple | Purple | May–Sep | Zones 3–7 | Full sun | 5 ft × 5 ft |
| Bloomerang Purpink Reblooming | Purple | Apr–Oct | Zones 3–7 | Full sun | 4 ft × 2.5 ft |
| Bloomerang Purple | Purple | Apr–Sep | Zones 3–7 | Full sun | 5 ft × 5 ft |
| Bloomerang Showmound | White | Apr–Sep | Zones 3–7 | Full sun | 2.5 ft × 2.5 ft |
| Charles Joly | Purple | Apr–May | Zones 3–7 | Full sun | 10 ft × 8 ft |
| Katherine Havemeyer | Pink | May | Zones 3–7 | Full sun | 10 ft × 8 ft |
| Lilacthis page | Purple | May | Zones 3–7 | Full sun | 10 ft × 8 ft |
| Ludwig Späth | Purple | Apr–May | Zones 3–7 | Full sun | 10 ft × 8 ft |
| Madame Lemoine | White | Apr–May | Zones 3–7 | Full sun | 10 ft × 8 ft |
| Miss Kim | Blue | May–Jun | Zones 3–8 | Full sun | 6 ft × 5 ft |
| President Grevy | Blue | Apr–May | Zones 3–7 | Full sun | 10 ft × 8 ft |
| President Lincoln | Blue | May | Zones 3–7 | Full sun | 10 ft × 8 ft |
| Primrose | Yellow | Apr–May | Zones 3–7 | Full sun | 8 ft × 7 ft |
| Sensation | Purple | Apr–May | Zones 3–7 | Full sun | 10 ft × 8 ft |
| Wedgwood Blue | Blue | Apr–May | Zones 3–7 | Full sun | 5.5 ft × 7 ft |
| Yankee Doodle | Purple | May | Zones 3–7 | Full sun | 8 ft × 7 ft |
Good to know about Lilac
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note. A note reports what its source says; where that differs from a fact above, the fact above is this entry's stored value, and its mark says whether it has been checked.
Worth knowing
Full sun fixes two problems at once: shade that starves bloom also raises humidity and drives powdery mildew, so a sunny, open spot means more flowers, less disease. per NC State and Iowa State
Renewing an overgrown lilac
To renew an old lilac, remove a third of the oldest stems yearly over three years and keep bloom, or cut it low and lose three years of flowers. per Nebraska and Minnesota
Prune right after flowering
Lilac blooms on old wood and sets next year's buds the summer after it flowers, so prune right after bloom; a later cut removes next year's flowers. per NC State and Penn State
Needs a cold winter
Common lilac needs a long winter chill for its flower buds to mature, so it blooms poorly in the deep South and other mild-winter regions. per NC State and Minnesota
Mind the name
Do not confuse it with 'Persian lilac', a name also used for chinaberry (Melia azedarach), an unrelated and genuinely poisonous tree. per NC State
It suckers from the roots
Lilac suckers from the roots and can slowly form a thicket. Most plants are grafted, so remove rootstock suckers, or you get a different plant than the named top. per NC State and Minnesota
What pairs well with Lilac
Good companions share its growing conditions and add something it lacks: an earlier or later bloom, a lower carpet in front, or structure through winter.
Carnival Scotch Heather
Shares full sun and moderate water; blooms in early summer as this one finishes; low at 8 in, to carpet the ground beneath; both offer pollinator forage, in different months.
Buffalograss
Shares full sun and low to moderate water; blooms in early summer as this one finishes; low at 8 in, to carpet the ground beneath; both offer pollinator forage, in different months.
Common Black-Eyed Susan
Shares full sun and moderate water; blooms in early summer as this one finishes; both offer pollinator forage, in different months; its seed heads stand through winter, for structure and the birds.
Blue Star Japanese Aster
Shares full sun and moderate water; blooms in early summer as this one finishes; both offer pollinator forage, in different months; its seed heads stand through winter, for structure and the birds.
Color Coded Frankly Scarlet Coneflower
Shares full sun and moderate water; blooms in early summer as this one finishes; both offer pollinator forage, in different months; its seed heads stand through winter, for structure and the birds.
Feather Reed Grass
Shares full sun and moderate water; blooms in early summer as this one finishes; both offer pollinator forage, in different months; its seed heads stand through winter, for structure and the birds.
Lavender
Shares full sun and low to moderate water; blooms in early summer as this one finishes; both offer pollinator forage, in different months; evergreen, so the bed keeps its shape through winter.
Purple Lovegrass
Shares full sun and low to moderate water; blooms in midsummer, extending the bed's season; both offer pollinator forage, in different months; its seed heads stand through winter, for structure and the birds.
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Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.