Dracaena trifasciata
Snake plants store water in thick leaves and thrive on neglect. The most common way to lose one is to water it too often, especially in a dim room or in winter.
Your answer
Water when the soil reaches this point
How it shifts through the year
Often much less than people expect, sometimes every two to four weeks, and less in winter or low light. Check that the soil is dry first.
Rot from overwatering is the usual cause. Remove the plant from the pot, cut away soft roots, and repot in fresh dry mix.
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Related guides
Estimates use rules of thumb. Always confirm with your finger: push it about an inch into the soil before you water.