About
Gymnocalycium horstii subsp. buenekeri, the spider cactus, is a spherical cactus with shiny, green, rounded ribs and flat, star-shaped areoles bearing five spreading spines. Large, cream to pale-pink, funnel-shaped flowers are produced in summer. A beautiful and rewarding cactus for a sunny greenhouse bench.
About the genus
Gymnocalycium are spherical or cylindrical cacti from South America with ribs divided into rounded, spiny tubercles and funnel-shaped flowers, mainly in shades of pink, white or red, in early summer. Popular, easy-care cacti for a sunny greenhouse bench or windowsill.
Growing conditions
SunlightFull sun, Partial shade
Soil typeSand
Soil pHNeutral
Soil moistureWell-drained
AspectEast-facing, South-facing, West-facing
ExposureSheltered
UK hardinessH2
Plant details
Plant typeCactus Succulent
HabitClump forming
FoliageEvergreen
Height0.1-0.5 metres
Spread0.1-0.5 metres
Time to full height2-5 years
Suggested usesCity and courtyard gardens, Coastal, Gravel garden, Houseplants, Patio and container plants
Native toBrazil
Care notes
CultivationWill grow well in a porous potting mix in the ground or a container avoiding waterlogging.
PruningNo pruning required
PropagationPropagate from seed
Pest resistanceMay be susceptible to mealybugs, spider mites, scale insects
Disease resistanceMay be susceptible to root rot.