It's common knowledge that keeping houseplants is a simple way to create a healthier indoor environment. But what do you do if your houseplant seems to be on the verge of dying? It might be the soil. Potted plants need nutrients, and if they've been living in the same potting soil, they have nothing left to live on. Try lifting the plant out of the pot, gently shaking off the old soil and repotting it with a new organic soil mix. Add old coffee grinds or tealeaves to the mix, too. Water the plant and wait a few days to see if this rejuvenates your old fern.