How to Grow Potatoes in Containers in 8 Simple Steps Pillipedes (pill millipedes) thrive in a humid enclosure with deep substrate made of organic soil, leaf litter, and decaying wood, which also provides much of their diet. They benefit from regular misting, Fungus gnats don't stand a chance when you do this. Dry out the soil Add a dry top layer Treat the soil to kill the larva That's the exact playbook I've used How to Repot a Jade Plant in 4 Simple Steps