If dark spots appear on the leaves of the sansevieria, you cannot delay, otherwise the plant will “burn” instantly.
The danger threatens not only the flower, popularly nicknamed “mother-in-law’s tongue”, but also nearby plants.
Dark spots on the leaves of Sansevieria are a sign of a serious disease. The problem is most likely in the wrong soil. The soil is contaminated or the plant has a bacterial disease.
There is no need to rush to get rid of such a flower. The plant can be saved. Success depends on when the spots on the leaves were discovered and how quickly they began to act.
Of course, efficiency plays a big role in the outcome of the case. The later you start doing something, the less likely it is that the result will be positive.
For example, if there are a few spots on the leaf or even just one, you can cut it off and put it in water. The cutting will take root and you can put it in the soil. If the entire leaf has turned black, nothing will work.