Scutellaria altissima

RHS Plant Profile
Somerset skullcap

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Somerset skullcap Dorling Kindersley Ltd
Somerset skullcap Dorling Kindersley Ltd

Other common names

tall skullcap

Herbaceous Perennial
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A clump-forming perennial with bright green, triangular, toothed leaves and upright spires of hooded, pale purple and dark lilac blue, two-tone flowers

Position

Full sun, Partial shade

Soil Types

Chalk, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

Chalk Loam Sand
Moisture
Well–drained
pH
Alkaline or Neutral

Position

Full sun Partial shade
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)
H4

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Lamiaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Bushy
Genus
Scutellaria are annuals, herbaceous perennials or sub-shrubs with opposite pairs of leaves and blue, violet, yellow or white, two-lipped, tubular flowers borne in the leaf axils or in terminal spikes
Name Status
Correct
Plant Range
Italy & Balkans to Turkey, Caucasus

How to Grow

Cultivation

Grow in light, well-drained, neutral to alkaline soil in full sun or light shade

Propagation

Propagate by seed sown in autumn, or by division in autumn or spring, or by softwood cuttings in late spring or early summer

Suggested planting locations and garden types

  • Cottage and informal garden
  • Flower borders and beds

Pruning

No pruning required

Pests

Generally pest-free

Diseases

Generally disease-free