Echinocactus grusonii (Golden Barrel Cactus, Golden Ball, Mother-in-Law's Cushion)


Michael's Opinion

A 'red-listed' CITES protected endangered species but widely available in cultivation.

Botanical Information

FamilyCactaceae
GenusEchinocactus
Speciesgrusonii
CategoryTropicals
OriginCentral Mexico

Details

USDA Hardiness Zone11a - 11b
USDA Hardiness Ref.
Canadian Hardiness ZoneRequires cool season protection under glass.
Canada Hardiness Ref.
RHS Hardiness ZoneH1c
RHS Hardiness Ref.
Temperature (°C)4 - 10
Temperature (°F)40 - 50
GrowthMedium

Description and Growing Information

ShapeSpherical.
CultivationWhile easy to grow, these plants do have some basic requirements; an average minimum winter temperature of 12 C, good drainage with less watering in winter. Excess water in cool periods may lead to rot. Golden Barrels are hardy to about -8 C for brief periods.
Notable SpecimensRoyal Botanical Gardens, Burlington, Ontario, Canada.
Flower DescriptionSmall yellow flowers appear in summer around the crown of the plant, but only after about twenty years.

Photographs