If your Sansevieria trifasciata is dying, there could be 2 possible reasons: Overwatering and pest infestation. Overwatering Keeping the roots in moist conditions for a long time will cause them to rot and develop a fungal infection. A sign of infection is discoloration on the leaves or stem of the Snake Plant. To save Sansevieria trifasciata, cut off the infected parts with a sanitized and sharpened pair of garden scissors. Uproot the plant from the soil and cut off the rotting roots. Allow Snake Plant to dry and replace the soil with a fresh batch of cactus mix. Replant the succulent in its new home and water only when the soil is 100% dry. Pest Infestation Sansevieria trifasciata is also the favorite succulent of pests such as mealybugs and spider mites. These pests will drain the Snake Plant of its nutritious sap and leave it vulnerable to fungal infection. If you see white cotton-like substances on its leaves, remove them with 70% isopropyl alcohol or insecticide soap. You can also spray Snake Plant with neem oil to keep pests away.