• 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

Primula Harlow Car hybrids (Pf)

© RHS

  • Synonyms Primula japonica 'Harlow Carr'

  • Family Primulaceae

  • Genus Primula are herbaceous or semi-evergreen perennials, forming a basal rosette of simple leaves, with salver-shaped or bell-shaped flowers which may be solitary or carried in an umbel or in whorls on an erect stem

  • Horticultural Group Proliferae section primulas are moisture-loving herbaceous or semi-evergreen perennials forming a rosette of basal leaves, with erect stems each carrying several whorls of salver-shaped flowers

  • Details Harlow Car hybrids are semi-evergreen perennials producing rosettes of pale green leaves. The flowering stems reach 60cm with whorls of flowers creating a candelabra effect. Colours include pink, peach, orange, yellow and purple

Characteristics

  • Foliage Semi-evergreen

  • Habit Columnar/Upright

  • 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)

    H6

Colour

Sunlight

  • Partial Shade

  • Full Sun

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

  • Exposure Sheltered

Soil

  • Clay

    Clay

  • Loam

    Loam

  • MoisturePoorly-drained

  • SoilClay, Loam

  • pHAcid, 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 partial shade, in deep, humus-rich, moist, neutral to acid loam soil, or peaty soil. Tolerates full sun if soil remains moist at all times

Propagation Propagate by seed sown in containers in an open frame, as soon as ripe or in late winter or early spring. Divide between autumn and early spring. Root basal cutting or offsets in autumn or early spring

Suggested planting locations and garden types Flower borders and beds Cottage & Informal Garden

How to care

Pruning No pruning required

Pests Prone to aphids, leaf hoppers and slugs

Diseases May suffer from a virus, primula brown core and grey moulds (botrytis)

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