Obviously this family is just too big to discuss here. Basic care- Warmth in summer, along with moderate to low water and occasional fertilizer. Soil ranges greatly, but a standard CS mix will do fine with most species. Exposure is the largest consideration. Basically, and I'm greatly understating the complexity of the issue, but smaller cactus tend to need more shade. Large columnar types tend to need less shade. The more the spines shade the stem, the more sun the plants can take. Completely nude plants usually require broken shade. In winter, plants should be allowed to go through a cool and dry period of at least a month. This tends to give better flowering in spring and summer.
