This becomes a reservoir when irrigating. Select small plants. In most cases, cactus will never outgrow the container. Remove plants from their original containers and heavily disturb the root ball. I break up the roots so they will reach out into their new surroundings quick.
Plant cactuses closer than normally done in the garden.
You'll find them growing upward and outward, creating an appearance of great abundance for added beauty. Plant them at the same depth found in the original container. This is where people have problems. They plant too deep allowing water to concentrate around the base of the plant. The plant tissues soften and cause rot to set in.