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ShrubsSynonym

Lavandula × intermedia 'Old English' misapplied

lavender 'Seal'

'Seal' is a vigorous, bushy shrub to 1m tall with aromatic, narrow, grey-green leaves and long spikes of strongly-scented, blue-purple flowers produced freely in summer

Synonyms

Lavandula angustifolia 'Seal'
Lavandula × intermedia 'Old English' misapplied

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Ultimate height

0.5–1 metres

Time to ultimate height

2–5 years

Ultimate spread

0.5–1 metres

Chalk

Loam

Sand

Moisture

Well–drained

pH

Acid, Alkaline, Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun

Aspect

West–facing or East–facing

Exposure

Sheltered

Drought resistance

Yes

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: Lamiaceae
Native to GB / Ireland: No
Foliage: Evergreen
Habit: Bushy
Genus: Lavandula are small aromatic evergreen shrubs with usually narrow, simple, entire, toothed or lobed leaves and small tubular flowers in dense spikes in summer
Name status: Accepted

How to grow

Cultivation

Prefers a well-drained neutral to alkaline soil but tolerates acidic conditions. In heavy soil improve drainage as it does not tolerate waterlogging. Potash will encourage flowering but high nitrogen fertilisers and manure will result in floppy plants. See lavender cultivation for further advice

Propagation

Propagate by semi-hardwood cuttings, may not come true from seed

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Patio and container plants
Rock garden
Wildlife gardens
Mediterranean climate plants
Gravel garden
Flower borders and beds
Banks and slopes
Garden edging

Pruning

Pruning group 10, after flowering

Pests

May be susceptible to rosemary beetle and cuckoo spit (froghoppers)

Diseases

May be susceptible to grey moulds (Botrytis) and honey fungus (rarely)

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