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Astrophytum myriostigma AGM

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© RHS

Characteristics

Plant type

Cactus/Succulent or Conservatory/Greenhouse

Habit

Columnar/Upright

Resilience

Hardiness

H2 (tender - cool or frost-free greenhouse)

Colour

Flower

Pale Yellow in Summer

Size

Ultimate height

0.1-0.5 metres

Ultimate spread

0-0.1 metre

Time to ultimate height

10-20 years


Preferred common name

bishop's mitre

Family

Cactaceae


Astrophytum are compact perennial cacti with ribbed, spherical or columnar stems bearing woolly, sometimes also shortly spiny areoles, and large, solitary, funnel-shaped flowers in summer, followed by red or green berries

A. myriostigma is a cactus forming a spherical or shortly columnar, ribbed grey-green spineless plant to 20cm tall; light yellow flowers 5cm across, sometimes reddish in centre, open in summer

Other common names

  • bishop's cap
  • bishop's hood
  • monk's hood

How to grow

Sunlight

  • Full sun

Aspect

  • South-facing or West-facing
  • Sheltered

Cultivation

Under glass grow in cactus compost with added limestone chippings, in bright filtered light. Lightly water in growing season but keep dry when dormant. In warmer climates outdoors grow in sharply drained, poor, slightly alkaline soil in full sun.

Soil

  • Well-drained
  • Alkaline or Neutral
  • Sand or Chalk

Propagation

Propagate by seed sown at 21°C (70°F) in early spring

Suggested planting locations and garden types

Patio/Container Plants


How to care

Pruning

No pruning required

Pests

mealybugs may be a problem

Diseases

Generally disease free