This is a cristata form of the Echinopsis minima. It can grow up to 6” tall. The genus echinopsis is native to southern South Africa. This globular cacti are quite cold tolerant. Free flowering with large white, yellow, pink or lavender flowers. Cristata forms usually don’t bloom. Protect from frost to avoid scarring. Provide filtered light. Hardy to 20F
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz
