• 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

Goeppertia lancifolia

rattlesnake plant

rattlesnake plant

© RHS 2003

  • Other common names rattlesnake plant

  • Synonyms Calathea insignis hort.
    Calathea lancifolia

  • Family Marantaceae

  • Genus Goeppertia are evergreen rhizomatous perennials forming clumps of elliptic leaves, often attractively-patterned; racemes of small tubular flowers are seldom produced in cultivation. Previously included within the genus Calathea

  • Details G. lancifolia is an evergreen perennial to 60cm, forming a clump with undulate, lance-shaped pale green leaves with dark patches either side of the midrib, deep purple beneath. Small yellow flowers appear in short spikes in summer

Characteristics

  • Foliage Evergreen

  • Habit Clump-forming

  • 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)

    H1A

Colour

Sunlight

  • Partial Shade

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

  • Exposure Sheltered

Soil

  • Clay

    Clay

  • Chalk

    Chalk

  • Loam

    Loam

  • MoistureWell-drained, Moist but well-drained

  • SoilClay, Chalk, Loam

  • pHAcid, Alkaline, Neutral

Size

  • Ultimate height 0.5-1 metres

  • Ultimate spread 0.1-0.5 metres

  • Time to ultimate height 5-10 years

How to grow

Cultivation Under glass grow in loam-based or loam-less potting compost with bright indirect or filtered light. Provide high humidity, draught-free conditions and a constant temperature of at least 16 °C. Water moderately when in growth and keep just moist in winter. Apply a balanced liquid fertiliser monthly

Propagation Propagate by division in late spring

Suggested planting locations and garden types Low Maintenance Patio & Container Plants

How to care

Pruning No pruning required

Pests May be attacked by glasshouse whitefly and glasshouse red spider mite

Diseases Generally disease free

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