Cactus Light Guide: how much sun does a cactus need for thriving The Cactus Outlet Prickly Pear Cactus (aka Opuntia species) Backyard Forager My New CALATHEA DOTHIE Bright indirect or medium light; direct light can burn leaves & fade color., Water when the two couple of inches or soil are dry., Soil should be lightweight & well aerated., How cute are these little cactus with googly eyes?! Here's to hoping that these adornments do not negatively affect them.