Syringa vulgaris

RHS Plant Profile

common lilac

Other common names

pipe privet, pipe tree

Shrubs

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This is the wild species of Lilac from which all our modern varieties have been selected. It is a deciduous shrub which grows into a bushy thicket of around 7 x 7m and has green heart-shaped leaves. The light blue-purple flowers are very sweet-smelling in early summer.

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

4-8 metres

Max Spread

4-8 metres

Size

Time to Maturity: 10–20 years
Max Spread: 4-8 metres
Max Height: 4-8 metres

Growing Conditions

Chalk Clay Loam Sand

Moisture: Moist but well–drained or Well–drained
pH: Alkaline or Neutral

Position

Full sun

Aspect: East–facing or North–facing or South–facing or West–facing
Exposure: Exposed or Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H6

Colour & Scent

Fragrance Flower

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Oleaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Bushy, Clump forming
Genus: Syringa can be deciduous shrubs or trees, with simple, entire or rarely pinnate leaves and conical panicles of small, very fragrant, 4-lobed tubular flowers in late spring or early summer
Name Status: Correct

How to Grow

Cultivation

Easy to grow in good light, in moist but well-drained soil. It likes neutral to alkaline soil and thrives in chalky ground.

Propagation

Propagate by softwood cuttings in summer

Suggested planting locations and garden types

Cottage and informal garden
Banks and slopes
Cut flowers

Pruning

Pruning group 1 or can tolerate hard pruning if needed

Pests

May be susceptible to lilac leaf-mining moth, privet thrips; and also to pigeon damage

Diseases

May be susceptible to lilac blight, honey fungus, phytophthora, powdery mildews and bacterial canker (Pseudomonas Syringae)