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Lavandula × intermedia 'Old English' misapplied
  • RHS Plants for pollinators

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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Size
Ultimate height
0.5–1 metres
Time to ultimate height
2–5 years
Ultimate spread
0.5–1 metres
Growing conditions
Chalk
Loam
Sand
Moisture
Well–drained
pH
Acid, Alkaline, Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green Grey Silver
Summer Blue Purple Green Grey Silver
Autumn Green Grey Silver
Winter Green Grey Silver
Position
  • Full sun
Aspect

West–facing or East–facing

Exposure
Sheltered
Drought resistance
Yes
Hardiness
H5
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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