Gymnocalycium horstii 6.5cm
Origin and Habitat: Uruguay, East Paraguay, South Brazil and Northeast Argentina. extent of occurrence is 40,000 km2).
Description: Gymnocalycium horstii is a distinctive large cactus, minimally spined with a green ball-shaped body. Usually solitary or slowly clustering as they age. Two subspecies are recognized, the nominate form and subsp. buenekeri (Swales) P.J.Braun & Hofacker. The latter was previously considered a good species, genetic studies are required to see if it should be raised to species level again.
Cultivation and Propagation: Very easy to grow, this plant offers no cultivation difficulties. Summer grower needs moderate to copious watering in summer (It enjoy more water than the average cactus). Quite frost resistant if kept dry in winter -4°C. Feed with a high potassium fertilizer in summer.
Sun Exposure: Light shade. (Keep out of hot, direct sun or will burn badly but hot, blazing afternoon sun taking it well, just bronzing a bit).