shrub
Common lilac
Syringa vulgaris
Preview: plant data is awaiting horticulturist review. A professional horticulturist hasn't reviewed our plant table yet. Lists still follow fixed rules for zone, sun, pets, deer and invasive status.
Common lilac is a deciduous shrub hardy in zones 3–7. Expect 8–15 ft of height and 6–12 ft of spread; our lists space it 8 ft apart. It does best in full sun with average water. Expect purple flowers in May. In a FloraVista list it usually plays the anchor role: the one larger plant that anchors the back of a bigger bed. Deer may browse it when other food is short, and it is not listed as toxic to dogs or cats. Our rules leave it out of lists in the Southeast, Florida and the Gulf and Texas and the South-Central states, where summer heat, humidity or mild winters hold it back even inside its zone range.
Facts from our plant table
- Botanical name
- Syringa vulgaris
- Plant type
- Shrub, deciduous
- Hardiness zones
- 3 to 7
- Sun
- Full sun (6+ hours)
- Water
- Medium
- Soil
- Needs good drainage; tolerates alkaline soil.
- Mature size
- 8–15 ft tall × 6–12 ft wide
- Spacing
- 8 ft apart (centre to centre)
- Growth rate
- Medium
- Bloom
- May · purple
- Roles in a bed
- Anchor, Structure
- Styles
- cottage, classic
- Deer resistance
- Medium: browsed when deer are hungry
- Pets
- Not listed as toxic to dogs or cats. Lilac (Syringa) is listed non-toxic to dogs and cats by the ASPCA.
- Native to
- Not native to the US (or a garden hybrid)
- Pot size and price
- 5-gallon pot, typically $40–$70 (easy to find)
- Plant in
- Spring or Fall
- First-year watering
- Water deeply once or twice a week through the first summer, more in heat waves, so the root ball never dries out.
- Pruning
- Prune after flowering; renew by cutting a third of the oldest stems to the ground each year.
Sources: Missouri Botanical Garden Plant Finder; ASPCA toxic and non-toxic plant list; Rutgers NJAES deer resistance ratings (A-D); state noxious weed lists / Invasive Plant Atlas of the US; typical 2026 US garden-centre and big-box listings. Not yet reviewed by a horticulturist.
Good companions
The plants our list engine most often puts in the same bed as Common lilac, across the sun, zone, pet, deer and style combinations it fits.
- Spike speedwell 'Royal Candles'Veronica spicata 'Royal Candles'perennial · zones 3–8
- Feather reed grass 'Karl Foerster'Calamagrostis × acutiflora 'Karl Foerster'ornamental grass · zones 4–9
- Garden phlox 'David'Phlox paniculata 'David'perennial · zones 4–8
- Lamb's ear 'Helen von Stein'Stachys byzantina 'Helen von Stein'perennial · zones 4–8
- Weigela 'Wine & Roses'Weigela florida 'Alexandra'shrub · zones 4–8
- Stonecrop 'Autumn Joy'Hylotelephium 'Herbstfreude'succulent · zones 3–9
If you can't find it
Substitutes our engine offers for Common lilac: same role in the bed, passing the same rules. Some of them are flagged toxic to dogs or cats: check the pet note before you swap.
- Weeping redbud 'Ruby Falls'Cercis canadensis 'Ruby Falls'zones 5–9 · not flagged toxic to pets
- Smoke tree 'Royal Purple'Cotinus coggygria 'Royal Purple'zones 4–8 · flagged toxic to pets
- Crape myrtle 'Tonto'Lagerstroemia 'Tonto'zones 7–11 · not flagged toxic to pets
- Panicle hydrangea 'Limelight'Hydrangea paniculata 'Limelight'zones 3–8 · flagged toxic to pets
How this page was made
This page was generated from this plant's record in FloraVista's plant table by fixed rules. The companions and substitutes come from the lists our rules engine composes. No named expert has reviewed this page.
Data status: the plant table is awaiting review by a horticulturist. Check each plant with a local nursery or extension office before you buy.
Sources
- Missouri Botanical Garden Plant Finder, state extension services and the USDA PLANTS database (zones, size, sun, water, bloom, native range)
- ASPCA toxic and non-toxic plant lists (dog and cat toxicity)
- Rutgers NJAES and regional extension deer-resistance ratings
- State noxious-weed and invasive-plant lists and the Invasive Plant Atlas of the US
- Typical US garden-centre listings (pot size and price band)
Generated . How FloraVista chooses plants