Lavandula dentata var. dentata 'Royal Crown'

RHS Plant Profile
French lavender 'Royal Crown'

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French lavender 'Royal Crown' RHS 1999

Synonyms

Lavandula dentata 'Royal Crown'

Award of Garden MeritPlants for pollinators
Shrubs Conservatory Greenhouse

A compact, rather tender evergreen shrub to 60cm in height, with narrow, dark green leaves with finely toothed margins, and long-stalked spikes of small purple flowers topped by pale purple bracts

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
2–5 years
Max Spread
0.5-1 metres
Max Height
0.5-1 metres

Growing Conditions

Chalk Clay Loam Sand
Moisture
Well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
South–facing or West–facing
Exposure
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)
H3

Colour & Scent

Fragrance Flower Foliage
Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

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

Thrives in well-drained, ideally slightly alkaline soil; will not tolerate waterlogging. In warmer regions, may be planted out in a sunny, sheltered position with winter protection. In areas prone to frost, grow in containers and overwinter in a greenhouse or conservatory. See lavender cultivation for more advice

Propagation

Propagate by semi-hardwood cuttings. See our video How to take lavender cuttings for more advice

Suggested planting locations and garden types

  • Coastal
  • Cottage and informal garden
  • Patio and container plants
  • City and courtyard gardens
  • Wildlife gardens
  • Mediterranean climate plants
  • Conservatory and greenhouse

Pruning

Pruning group 10; deadhead after flowering. Trimming in late summer prevents plants from becoming straggly, but you can leave plants for a season to benefit wildlife with seeds or as shelter if you prefer. Avoid pruning in autumn in wet or cold regions as this may leave plants vulnerable to winter damage. Avoid cutting back into old wood

Pests

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

Diseases

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