I've neglected to feed my cacti in the past, but I intend to do better this year. Currently I've got a bottle of some 1-7-6 "Cactus Juice" fertilizer with added calcium. Says cactus on the bottle, so it's got to be good right?
Alternatively, I've heard that our pee is great fertilizer when diluted with ~10x the same amount of water. Seems like maybe it would strengthen the bond between us and our plants too?