This cactus has been in the garden for about six years now, in a container, and not once has it ever complained. We sometimes forget to water it, yet it shows no signs of stress. Often people mistake watering cacti in containers, thinking they can be ignored. While they can tolerate dryness between watering, the containers are not their natural habitat...they will dry out too quickly and start using their stores. This Echinocactus grusonii has had one transplant into a larger pot, and it clearly needs a new pot again. Cacti are always a challenge transplanting, simply because of their spines. I usually wrap it in layers of rags and newspapers to buffer the risk of being poked, but they always find their way.