Dealing with Fungus Gnats and Centipedes in Snake Plant

A 10-year-old Sansevieria (mother-in-law's tongue) develops tiny flies (fungus gnats) and worms (centipedes) after repotting with non-sterile garden soil. Expert Will Creed recommends undoing the repotting: remove added soil, return the rootball to a smaller pot without extra soil. Let soil dry almost to the bottom before watering—Sansevieria tolerates drought but not constant moisture. Dry conditions kill gnat larvae.

For remaining centipedes, flood the pot (up to rim) for 30 minutes to force them out. They're harmless but can be a nuisance.