• 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

Cleistocactus samaipatanus

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

© RHS

  • Synonyms Akersia rosieflora
    Bolivicereus samaipatanus

    Borzicactus samaipatanus

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  • Family Cactaceae

  • Genus Cleistocactus are erect columnar cacti with ribbed, eventually branched, cylindrical stems bearing dense spines and tubular flowers

  • Details C. samaipatanus is a tall, narrow, columnar cactus, with light green stems, bearing 14 ? 17 ribs and stiff pale yellow spines 0.5 ? 3 cm long. Mature plants branch freely from the base, producing several upright stems to 1.5 m high, with each stem up to 5 cm in diameter. The flowers are brilliant red, to 5 cm (2 in) long and 2.5 cm (1 in) wide. The reddish fruits are small and spherical, to 1cm long and wide, bearing dense white and brown hairs

  • Plant range Bolivia

Characteristics

  • Foliage 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)

    H2

Colour

Sunlight

  • Full Sun

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

  • Exposure Sheltered

Soil

  • Sand

    Sand

  • Loam

    Loam

  • MoistureWell-drained

  • SoilSand, Loam

  • pHAcid, Neutral, Alkaline

Size

  • Ultimate height 1-1.5 metres

  • Ultimate spread 0.5-1 metres

  • Time to ultimate height 10-20 years

How to grow

Cultivation Grow under glass in a standard cactus compost, in full light. Provide low humidity. Water freely when in growth and keep completely dry at other times. Apply a dilute low nitrogen fertilizer fortnightly during late spring and summer

Propagation Propagate by seed or stem cuttings

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

How to care

Pruning No pruning required

Pests Can get glasshouse red spider mite, glasshouse whitefly and mealybugs

Diseases Generally disease free

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