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Syringa × chinensis

Rouen lilac

A bushy deciduous shrub or small tree, up to 4m high, with arching stems and oval-shaped, deep green leaves. Clusters of very fragrant, lilac-purple flowers to 15cm long are produced in late spring

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Ultimate height

2.5–4 metres

Time to ultimate height

5–10 years

Ultimate spread

2.5–4 metres

Chalk

Clay

Loam

Sand

Moisture

Moist but well–drained, Well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

East–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)

Botanical details

Family: Oleaceae
Native to GB / Ireland: No
Foliage: Deciduous
Habit: Bushy
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

Thrives in well-drained, fertile, humus-rich alkaline to neutral soils in full sun, though this hybrid will often tolerate slightly acidic soils and some light shade. Mulch regularly

Propagation

Propagate by softwood cuttings or by layering in early summer, by grafting in winter or by chip budding in midsummer

Suggested planting locations and garden types

Architectural
Cottage and informal garden
Low Maintenance
Flower borders and beds
Hedging and screens
Wall side borders

Pruning

Minimal pruning required, trim immediately after flowering if necessary (see pruning group 1)

Pests

May be susceptible to lilac leaf-mining moth, thrips and willow scale insects

Diseases

May be susceptible to lilac blight, honey fungus, phytophthora, powdery mildews and bacterial canker

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