Keep your cactus in a place where the temperature is approximately 20° c. Lightly tamp down the soil around the cactus when you're done. How To Care For African Milk Plant Or Euphorbia Trigona African Milk Tree Euphorbia Plant African Plants Planting is also a part of the fairy castle cactus care. How to take care of a cactus in a pot . Make sure the pot and soil have good drainage. It would, however, be highly beneficial if you planted the cactus in a good cactus potting soil, which you can also make on your own easily. After you have the tools we can begin to take cuttings from the cactus or succulent. Our final tip on how to take care of small cactus is the container! Then, lightly water the soil so it compacts. Simply fill your pot with the prepared soil, dig a hole a little larger than the root ball, and place the cactus in the hole. They are easy to take care of and grow quickly when put outside in the warmer months. The first step is to plant your new c...