Cactus e Dintorni

Habitat: South America: southern Brazil, northern Uruguay, Paraguay, Argentina; regions characterized by heavy, erratic downpours.
Description: a group of small, spherical cacti, not exceeding 3-4 cm (1-1.5 in) in width and 6-7 cm (2.5-3 in) in height, that often form clumps. The spines are thin and short and the diurnal flowers appear in the summer; these may sometimes remain closed, yet seeds are still produced by self-pollination (cleistogamy).
Soil: clayey, sandy, free-draining soil with small amounts of humus and an acidic pH.
Location: grow in partial shade. Full sun is better when the plant is in flower.
Temperature: minimum temperature of 6-8°C (43-46°F).
Water: water thoroughly from time to time during the warmer months adding some fertilizer; water spray mist is also beneficial. As for their period of rest, follow the instructions you find in ‘cultivation tips’. It is extremely important that you use rainwater instead of tap water.
Cultivation tips: raise from fresh seeds; it is fast-growing. They’re best grown in clay pots placed in plastic containers filled with wet sand, so that the roots are kept constantly moist; this is paramount in the wintertime.
Main species of Frailea: Frailea castanea = asteroides: it can be grafted and enjoys a warm site in indirect light; Frailea pygmaea; Frailea aureispina; Fv fulviseta; Frailea fulvolanata; Frailea gracillima; Frailea grahliana; Frailea horstii; F. magnifica; Frailea phaeodisca; Frailea pumila.