Cacti thrive in some of the most inhospitable locations around the world.  Most of these places are found in the Southwest United States, Mexico, and South America.  Many cacti can also be successfully grown indoors.

There are three main factors that determine whether or not a cactus will live or die when it is brought inside:  soil, sunlight, and water.  When planting a cactus, it is important to make sure you have well-draining soil as delicate roots rot easily in wet conditions.  Cactus soil is usually a mix of top soil, pumice or perlite, and coarse (builder's) sand.  As for how much water a cactus needs, it depends on the species.  In general, though, cacti need more water during the growing season (spring and summer) and less during the resting season (fall and winter).  It is also important to look at the plant's species to find out how much light it needs.  Most cacti are used to a lot of sun, but some prefer partial shade.  Light is usually less in the fall and winter as well.

Following guidelines specific to the cactus is important to maintain a healthy plant, especially if you hope for it to bloom.  One species that does well indoors is the glory of Texas cactus (Thelocactus heterochromus).  This species' pink and red flowers and unusual striped spines make it one of the most beautiful cacti you can own.