How Often to Mist Air Plants? The Answer May Surprise You Stop Fungus Gnats in Your Home!, Tiny black flies around your houseplants?, Theyre fungus gnats, and their larvae can damage plant roots., Quick Fixes:, 1 Let the soil dry, 2 Use yellow Do you grow hellebores in pots?.. I do. They require a large container because they develop an extensive root system. I use them in my spring display with buttercup, ivy, pansies, grasses, spring 15 plants that are natural air purifiers for your home