• 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

Amaranthus hypochondriacus 'Green Thumb'

prince's feather 'Green Thumb'

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
prince's feather 'Green Thumb'

© RHS 1999

  • Other common names prince's feather 'Green Thumb'

  • Family Amaranthaceae

  • Genus Amaranthus can be upright or spreading annuals or short-lived perennials, with simple leaves and tiny flowers borne in dense, erect or pendulous, catkin-like inflorescences in summer and autumn

  • Details 'Green Thumb' is a bushy upright-growing annual to 60cm, with large, oblong, purple leaves and erect, plume-like, bright yellow-green inflorescences from summer to early autumn. Good for cutting or drying

Characteristics

  • Foliage Deciduous

  • 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)

    H2

Colour

Sunlight

  • Full Sun

  • Aspect South-facing or West-facing

  • Exposure Sheltered

Soil

  • Chalk

    Loam

  • MoistureMoist but well-drained

  • SoilLoam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 0.5-1 metres

  • Ultimate spread 0.1-0.5 metres

  • Time to ultimate height 1 year

How to grow

Cultivation Under glass, grow in loam-based potting compost such as John Innes Number 2, in full sun in a sheltered position

Propagation Sow seed at 20°C (68°F) in mid spring

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

How to care

Pruning None required

Pests Aphids may be a problem

Diseases A virus may be troublesome

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