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Penstemon hartwegii AGM

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Characteristics

Plant type

Herbaceous Perennial

Habit

Clump-forming

Resilience

Hardiness

H4 (hardy - average winter)

Colour

Flower

Red and White in Autumn and Summer

Foliage

Green in Autumn, Spring, Summer and Winter

Stem

Purple in Autumn and Summer

Size

Ultimate height

0.5-1 metres

Ultimate spread

0.1-0.5 metres

Time to ultimate height

2-5 years


Preferred common name

scarlet beard tongue

Family

Plantaginaceae


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

P. hartwegii is a bushy semi-evergreen perennial to 70cm in height, with narrow foliage and panicles or racemes of slender bright crimson flowers 4cm in length, marked white in the throat and borne on purple stems

Other common names

  • Hartweg penstemon

How to grow

Sunlight

  • Full sun

Aspect

  • South-facing, East-facing or West-facing
  • Sheltered

Cultivation

Grow in fertile, well-drained soil in a sheltered position in full sun or partial shade. In cold areas, protect plant overwinter with a dry winter mulch

Soil

  • Well-drained
  • Acid, Alkaline or Neutral
  • Chalk, Loam or Sand

Propagation

Propagate by softwood cuttings in early summer or semi-hardwood cuttings in midsummer. Propagate by division in spring

Suggested planting locations and garden types

City/Courtyard Gardens, Cottage/Informal Garden or Flower borders and beds


How to care

Pruning

Deadhead after flowering to maintain vigour, then cut back to base in winter

Pests

May be attacked by slugs, snails and chrysanthemum eelworms

Diseases

May be subject to a downy mildew