This is the cactus I've had the longest and my grandmother gave me a stem to start with when I was a child. I've had some trouble getting this plant to bloom while living in Wisconsin, but it really has been my own stupidity. I've been moving the plants outdoors in the spring, only to have them lose their buds. This year I simply left them in the same room I winter them in on our back porch. The room is unheated and quite dark - getting much colder than most growers think this species can tolerate - but the plants have set buds every spring. This is the first spring the buds have turned into flowers, and only because I didn't move the plants outdoors too soon.