Gymnocalycium horstii subsp. buenekeri

RHS Plant Profile
spider cactus

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Synonyms

Gymnocalycium buenekeri

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Cactus Succulent

A spherical cactus with shiny green rounds ribs, five spine areoles sitting flat in a star-shaped way and large cream to pale pink funnel shaped flowers in summer.

Position

Full sun, Partial shade

Soil Types

Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

Sand
Moisture
Well–drained
pH
Neutral

Position

Full sun Partial shade
Aspect
East–facing or South–facing or West–facing
Exposure
Sheltered
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
Drought Resistance
Yes

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Cactaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Clump forming
Genus
Gymnocalycium can be spherical or cylindrical cacti, with ribs divided into rounded, spiny tubercles, and funnel-shaped flowers in early summer
Name Status
Correct
Plant Range
Brazil

How to Grow

Cultivation

Will grow well in a porous potting mix in the ground or a container avoiding waterlogging.

Propagation

Propagate from seed

Suggested planting locations and garden types

  • City and courtyard gardens
  • Coastal
  • Gravel garden
  • Houseplants
  • Patio and container plants
  • Low Maintenance
  • Conservatory and greenhouse

Pruning

No pruning required

Pests

May be susceptible to mealybugs, spider mites, scale insects

Diseases

May be susceptible to root rot.