It never occurred to me to grow a cactus in an office setting. I would think they would need more light. But if you have a bright office you might consider giving it a try.
. . . It’s easy to become a corporate cactus cultivator if you know a bit more about these unique plants. They are all succulents, which are species that contain specialized cells that hold water for a long time. Ordinary plants can’t store water this way and are thus more dependent on consistent groundwater to keep them hydrated. They need extensive root systems to hunt and absorb the water.
Cacti produce rather small, shallow root systems just inches beneath the ground. There they suck up rainwater the moment it falls to earth. This ability to take up moisture faster than ordinary plants is their key to survival in excessively dry climates. It also means that you don’t need a big pot for cactus plant roots.
Succulents are vulnerable to one thing rot. Once waterborne bacteria or fungus enters these interior tissues, the rot spreads uncontrollably. In the wild, cacti prefer porous gravelly or sandy soils that water passes through quickly. Very little is left in contact with the succulent roots. Success with cacti depends on soil porosity in your pot. Fast or express drainage practically ensures you’ll never overwater this plant. That is, of course, if you don’t let water sit in the saucer for more than five minutes. . .