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Penstemon 'Pensham Plum Jerkum' (Pensham Series)

penstemon 'Pensham Plum Jerkum'

RHS Plant Shop from £6.99 Sold by 28 nurseries

  • Other common names penstemon 'Pensham Plum Jerkum'

  • Family Plantaginaceae

  • 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

  • Details 'Pensham Plum Jerkum' is a bushy, semi-evergreen perennial to 70cm in height with lance-shaped, green leaves. Upright racemes of small, tubular, plum-purple flowers, with white mottled throats, are borne from early summer to mid-autumn

Characteristics

  • Foliage Semi-evergreen

  • Habit Bushy

  • 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

Sunlight

  • Partial Shade

  • Full Sun

  • Aspect South-facing or West-facing or East-facing

  • Exposure Exposed or Sheltered

Soil

  • Sand

    Sand

  • Chalk

    Chalk

  • Loam

    Loam

  • MoistureWell-drained

  • SoilSand, Chalk, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 0.5-1 metres

  • Ultimate spread 0.1-0.5 metres

  • Time to ultimate height 2-5 years

How to grow

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

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 Flower borders and beds Low Maintenance Underplanting of Roses and Shrubs Cottage & Informal Garden Patio & Container Plants City & Courtyard Gardens Wildlife Gardens

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

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RHS Plants Shop

Penstemon 'Pensham Plum Jerkum' (Pensham Series)

penstemon 'Pensham Plum Jerkum'

Buy from £6.99 at the RHS Plants Shop

Buy from £6.99 at the RHS Plants Shop

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