This will keep the succulent safe from the freezing temperatures that may destroy it. Crassula Marginalis Rubra indoor plants should be kept in a warm area. Winter blooms are beautiful for the cactus if it is kept near a window. You can grow a cactus in a clay pot, plastic container, on the ground, window boxes or tray. Cover your container with clear plastic wrap to keep water in it. This is the best way for leaf cuttings to be propagated in water. You can keep more moisture in a larger pot than you need, so don't plant Star Cactus inside a larger container.