Barrel Cactus (New to Cacti)
Hello, early last week I purchased a small barrel cactus. I do not know the exact type of cactus. I am fairly new to gardening. After bringing the cactus home, I noticed that it had a small decay near the base. Not sure what caused it, or what it is. Any help of Identification of the cactus and problem will be appreciated :) Thank you.