Echinocactus grusonii, popularly known as the golden barrel cactus, golden ball or mother-in-law’s cushion, is a well known species of cactus, and is endemic to east-central Mexico. It is rare and endangered in the wild, where it is found near Mesa de León in the state of Querétaro, and in the state of Hidalgo.
Feed every 4 weeks with a high potassium fertilizer during summer. Humidity: Humidity does not seem to be a major concern for the Echinocactus grusonii, which makes the average indoor environment fine, as it is. Provide as much fresh air as you can , but not cold drafts.