Scarcely, specially in winter when it can be only slightly sprayed. About three times a month in summer, without leaving the soil be stagnant. Do not water till ground is well dry.
In garden pots indoors when it's cold or outside in warm weather.
Filtered sun.
By means of flat graft over another chlorophyllic cactaceae.
Rich humus soil, with sand, well drained . pH 5-6.
More information about plants in the listing above.