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Shrub · Oleaceae family

Common lilac

Syringa vulgaris

Full sun to part shade in a garden 2.5–4 m × 2–3.5 m Flowers May to −40 °C
Flower colours Click a colour

In short a 10-second read

SunFull sun to part shade
in a garden after 10 years2.5–4 m
in the wild up to 5 m
spacing 3 m
FlowersMay
PlantingMarch–April, October–November
WinterNo winter protection

Where to plant and how much to water

Sun, soil and water.

It grows best in full sun to part shade, in average soil.

Sun

Sun6 hours or more
Part shade3–6 hours
Shadeunder 3 h

Soil

tolerates any pH
acidicneutralalkaline
averageclayhumus-richloamy

Watering

only in dry spellsless when it rains

Frost

−40 °C
no winter protectionleafless in winter

How much space it takes

Mature size.

The mature plant next to a person (175 cm).

1 m2 m3 m4 m5 m2.4–5 mspread 1.8–3.6 m
2.4–5 m× spread 1.8–3.6 m

Plant 3 m apart.

Reaches maturity in about 10–20 years. The final size depends on the cultivar and the spot — we give the range from smallest to largest.

Calendar

Through the year.

Months for Central Europe. The line shows the current month.

The year at a glance

Flowers: JanuaryFlowers: FebruaryFlowers: MarchFlowers: AprilFlowers: MayFlowers: JuneFlowers: JulyFlowers: AugustFlowers: SeptemberFlowers: OctoberFlowers: NovemberFlowers: DecemberPlanting: JanuaryPlanting: FebruaryPlanting: MarchPlanting: AprilPlanting: MayPlanting: JunePlanting: JulyPlanting: AugustPlanting: SeptemberPlanting: OctoberPlanting: NovemberPlanting: DecemberFeeding: JanuaryFeeding: FebruaryFeeding: MarchFeeding: AprilFeeding: MayFeeding: JuneFeeding: JulyFeeding: AugustFeeding: SeptemberFeeding: OctoberFeeding: NovemberFeeding: DecemberJanFebMarAprMayJunJulAugSepOctNovDec
FlowersPlantingFeeding
Now, in October: a good time for planting (container plant).
JanFebMarAprMayJunJulAugSepOctNovDec

Flowers

JanFebMarAprMayJunJulAugSepOctNovDec

May · purple, white, pink or yellow

Planting

JanFebMarAprMayJunJulAugSepOctNovDec

container plant: March–April, October–November

Feeding

JanFebMarAprMayJunJulAugSepOctNovDec

May–June

Feeding

Nutrition.

Horn meal

up to 40 g/m² a year, if the soil needs it · May–June

JanFebMarAprMayJunJulAugSepOctNovDec

Pests and diseases

Common problems and what to do.

The most common problems in Central Europe. Protection is listed from the gentlest option.

High riskMedium riskLow riskRisk for this plant according to the source · no label = no documented level

What you will see

White powdery coating on leaves and shoots.

The source says: it is among the ornamental plants susceptible to powdery mildew.

How to protect

  1. Prevention
    • open pruning, do not plant too densely
    • rake up and remove fallen leaves
  2. By hand when presentremove affected parts
  3. Gentle spray at the first symptomspotassium bicarbonate or horticultural oil (only for heavy infestation)
  4. Chemical — only when nothing else helps as per the labelOnly if the damage is severe: a product authorised in your country against: powdery mildew.
Powdery mildewsdiseaseMedium risk

What you will see

White powdery coating on leaves and shoots.

The source says: it is among the ornamental plants susceptible to powdery mildew.

How to protect

  1. Prevention
    • open pruning, do not plant too densely
    • rake up and remove fallen leaves
  2. By hand when presentremove affected parts
  3. Gentle spray at the first symptomspotassium bicarbonate or horticultural oil (only for heavy infestation)
  4. Chemical — only when nothing else helps as per the labelOnly if the damage is severe: a product authorised in your country against: powdery mildew.
More about this problem

Lilac blight

disease

What you will see

Angular brown spots on leaves and stems, blackening around the veins of new leaves, browned wilted buds, shoots with a “shepherd's crook”.

When to look

In spring, soon after the new shoots emerge

How to protect

  1. Prevention
    • do not water young plants from above
    • rake up and dispose of fallen leaves
    • prune in spring after flowering for airiness
    • do not overdo nitrogen late in the season
  2. By hand spring after bud breakcut out infected shoots as soon as found, at least 15–20 cm below the infection; prune only in dry weather; disinfect tools between cuts
  3. Chemical — only when nothing else helps —No fungicide is available to home gardeners against bacterial blight of lilac
Lilac blightdisease · in spring, soon after the new shoots emerge

What you will see

Angular brown spots on leaves and stems, blackening around the veins of new leaves, browned wilted buds, shoots with a “shepherd's crook”.

When to look

In spring, soon after the new shoots emerge

How to protect

  1. Prevention
    • do not water young plants from above
    • rake up and dispose of fallen leaves
    • prune in spring after flowering for airiness
    • do not overdo nitrogen late in the season
  2. By hand spring after bud breakcut out infected shoots as soon as found, at least 15–20 cm below the infection; prune only in dry weather; disinfect tools between cuts
  3. Chemical — only when nothing else helps —No fungicide is available to home gardeners against bacterial blight of lilac
Sources (3)

Frequently asked

Quick answers.

When does common lilac flower?

In May; the flowers are purple, white, pink or yellow.

Does common lilac tolerate shade?

It tolerates part shade (3–6 hours of sun), but not full shade.

How much space does common lilac need?

At maturity 1.8–3.6 m wide and 2.4–5 m tall; recommended spacing 3 m.

Lilac blight — what can you do?

do not water young plants from above cut out infected shoots as soon as found, at least 15–20 cm below the infection; prune only in dry weather; disinfect tools between cuts

Powdery mildews — what can you do?

open pruning, do not plant too densely remove affected parts

Sources (17) Checked 24 October 2026

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