Echinocactus horizonthalonius

This is the smallest of Echinocacti, also very slow growing. The plant in the picture is probably decades old ans less than 4 inches tall.
Echinocactus horizonthalonius is known from South New Mexico and Texas, and adjacent Mexico, as well from separate location in Southern Arizona.
In culture Echinocactus horizonthalonius does not present problems, at least here in California. If watered periodically - once a month or so - it produces it's nice flowers, reliably in response to every summer watering.
Growing Echinocactus horizonthaloniusfom seed is an ambitious project. One definitely needs to start young. This and another plant I have are no doubt of wild origin, rescued from new mine project as I was told.