Cactus container garden Transform a container into a mini desert landscape by filling it with a variety of colorful cacti. We selected a beautifully painted, yet simple design of Saguaro cactus and use a well-drained cactus mix that has no peat moss, which is too acidic for cacti and retains too much moisture. In a container, cacti grow slowly and expand to the size of the container. You can transfer your cacti to a larger container when the plants have filled the pot or become top heavy after a