• 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

Osteospermum jucundum 'Blackthorn Seedling'

African daisy 'Blackthorn Seedling'

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
African daisy 'Blackthorn Seedling'

© RHS

  • Other common names African daisy 'Blackthorn Seedling'

  • Family Asteraceae

  • Genus Osteospermum can be annuals, perennials or sub-shrubs, with aromatic, evergreen, simple or lobed leaves and showy daisy-like flowers over a long period from late spring

  • Details 'Blackthorn Seedling' is a bushy perennial with narrow foliage and, from late spring to autumn, daisy-like flower-heads to 6cm across, with deep pink rays surrounding a yellow disk

Characteristics

  • Foliage Evergreen

  • Habit Bushy

  • Fragrance Leaf

  • 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 South-facing

  • Exposure Sheltered

Soil

  • Sand

    Sand

  • Chalk

    Chalk

  • Loam

    Loam

  • MoistureWell-drained

  • SoilSand, Chalk, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 0.1-0.5 metres

  • Ultimate spread 0.1-0.5 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Grow in moderately fertile, well-drained soil in full sun. Good for a sheltered position

Propagation Propagate by seed at 18°C (64°F) in spring or take softwood cuttings in late spring. Alternatively, propagate by semi-ripe cuttings in late summer

Suggested planting locations and garden types Flower borders and beds Garden Edging Ground Cover City & Courtyard Gardens Coastal Cottage & Informal Garden Gravel Garden Rock Garden Patio & Container Plants

How to care

Pruning Deadhead regularly to prolong flowering

Pests Prone to aphids

Diseases Can be affected by verticillium wilt

Did you find the information you were looking for?

RHS members can get exclusive individual advice from the RHS Gardening Advice team.

Join the RHS now

Get involved

We're a UK charity established to share the best in gardening. We want to enrich everyone's life through plants, and make the UK a greener and more beautiful place.