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Bloom calendar
Syringa vulgaris
Common lilac (species)
At‑a‑glance
- Group/Class: Common lilac (species)
- Height × spread: 12–16 ft × 8–12 ft (3.7–4.9 m × 2.4–3.7 m)
- Bloom window: mid to late spring
- Color & flower form: lilac to purple; conical panicles 6–8 in (15–20 cm)
- Fragrance: 3 strong
- USDA hardiness: zones 3–7
- Origin: Southeastern Europe
- Cut‑flower notes: woody stems; typical vase life 3–4 days after conditioning
- Pet safety: generally considered non‑toxic to dogs and cats
How it differs
- Sets the standard bloom timing for lilacs: mid to late spring.
- Taller and broader than dwarf or compact lilacs.
- Offers the widest color range among garden lilacs via cultivars.
- Produces the strongest traditional lilac fragrance.
- More prone to powdery mildew in humid summers than several other species.
Strengths
- Very cold hardy for northern climates.
- Abundant cultivar choice for color and form.
- Good hedge or screen when suckers are managed.
- Excellent cut‑flower fragrance.
Care in one minute
Site in full sun with at least 6 hours of direct light.
Plant in fertile, well‑drained soil; pH slightly acidic to slightly alkaline.
Water deeply in dry spells during the first two seasons; avoid soggy soil.
Feed sparingly in early spring if a soil test indicates need.
Deadhead spent panicles after bloom; prune immediately after flowering.
Thin oldest stems at the base every few years to improve air flow.
Watch‑outs
- Can develop powdery mildew; ensure sun and air flow.
- Requires winter chill; blooms are unreliable in warm Zone 8 and warmer.
- May attract borers and leaf spot; monitor established shrubs.
- Suckers from roots; remove to control spread.
Best uses (tags)
Provenance note
Native to southeastern Europe and in cultivation since the late 1500s. Introduced to North America by early colonists in the 1600s.
References
- Missouri Botanical Garden – Syringa vulgaris (Plant Finder)
- NC State Extension – Syringa vulgaris
- Chicago Botanic Garden – Keep Cut Lilacs Fresh Longer
