They are sent up under grow lights. I do water them but I have all of mine in semi-hydroponics so they are never sitting in water or get soggy. It has cut down on my rot problems tremendously. The plants also grow faster as the roots are free to roam. Semi-hydroponics are round, clay pellets. I use no dirt and haven't for many years. The container has 2 holes about an inch from the bottom. The water sits at the bottom and feeds the pellets to keep them moist. It was invented for orchids but I have had great success with this culture. It is amazing how many roots will grow right into the water and the plants don't rot. I think for many of these plants, this is close to how they grow in the wild.
I get my supplies from First Rays. He developed this system for orchids. I had orchids and I tried the succulents and caudiciforms. Had much better success with the latter. Actually, I don't have orchids anymore but I still have about 85 plants all in s/h.