• AGM plants

    AGM plants have been through a rigorous trial and assessment programme. They are:

    • Excellent for ordinary use in appropriate conditions
    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases

Parahebe perfoliata

Digger's speedwell

Digger's speedwell

© RHS 1999

  • Other common names Digger's speedwell
    Digger speedwell

  • Synonyms Hebe perfoliata
    Veronica perfoliata

  • Family Plantaginaceae

  • Genus Parahebe are small evergreen or semi-evergreen subshrubs with simple, toothed leaves and small saucer-shaped, 4-petalled flowers in loose racemes in spring or summer

  • Details P. perfoliata is a sprawling, evergreen woody-based perennial to 70cm in height, with broadly ovate, leathery, bright blue-green leaves 3-5cm in length, and axillary racemes of clear blue flowers 10mm across, in late summer

  • Plant range Australia

Characteristics

  • Foliage 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)

    H3

Colour

Sunlight

  • Full Sun

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

  • Exposure Sheltered or Exposed

Soil

  • Sand

    Sand

  • Clay

    Clay

  • Chalk

    Chalk

  • Loam

    Loam

  • MoistureWell-drained, Moist but well-drained

  • SoilSand, Clay, 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 Grows well in poor well-drained soil in full sun

Propagation Propagate by seed or semi-hardwood cuttings

Suggested planting locations and garden types Banks and Slopes Flower borders and beds Wall-side Borders City & Courtyard Gardens Coastal Cottage & Informal Garden Patio & Container Plants Rock Garden Gravel Garden

How to care

Pruning No pruning required

Pests Slugs may be a problem

Diseases Generally disease free

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