It may seem difficult to grow it, but it surely is easy to get it to flower in my growing set-up. I use a largely mineral soil-mix, comprising granite, some clay-ish calcarous stone chippings, large diameter river gravel, some sand, perlite and 5 to 10% wormcastings. Except for the perlite, everything is sort of DIY, as I never buy materials but prefer to collect it myself while visiting various places in the (nearby) mountains and hills.
Mature plants are kept outside, in full sun, with no shade and are subject to intense heat during the entire summer months. I give them rain water once per week or two times a month, depending on the heat and humidity. During the winter they are kept without water in a cool dry room. It is normal for them to shrivel and loose body volume in this period. The watering only resumes when outside temps exceed 18 degrees Celsius. I rarely feed them nutrients. If so, they should be poor in Nitrogen and applied in small doses at the beginning of the season, after the first waterings.
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