Penstemon fruticosus var. scouleri

RHS Plant Profile
Scouler penstemon

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Synonyms

Penstemon scouleri

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Shrubs
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A spreading, evergreen dwarf subshrub to 30cm in height, with narrow, glossy mid-green leaves and short, dense racemes of funnel-shaped pale to dark purple flowers to 5cm in length, in summer

Position

Full sun

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
Acid or Alkaline or Neutral

Position

Full sun
Aspect
South–facing or East–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)
H4

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Plantaginaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Bushy
Genus
Penstemon may be deciduous or evergreen perennials or subshrubs, with simple, narrow leaves and racemes or panicles of bell-shaped or funnel-shaped flowers in summer and early autumn
Name Status
Correct
Plant Range
Western N America

How to Grow

Cultivation

Grow in poor to moderately fertile, very gritty, well-drained soil in full sun. In cold areas, protect plant overwinter with a dry winter mulch. See penstemon cultivation for further advice

Propagation

Propagate by seed sown in pots in a cold frame. Propagate by taking softwood or semi-hardwood cuttings in midsummer

Suggested planting locations and garden types

  • Patio and container plants
  • City and courtyard gardens
  • Cottage and informal garden
  • Gravel garden
  • Rock garden
  • Wildlife gardens
  • Coastal
  • Flower borders and beds

Pruning

Deadhead after flowering to retain vigour

Pests

May be susceptible to slugs, snails and chrysanthemum eelworms

Diseases

May be susceptible to powdery mildews