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Dark leaves on a snake plant indicate that it is healthy and well-nourished. Leaves that have a yellowish tinge on the outer edge of the leaves or leaves that are pale and floppy could indicate that the plant is dying. Don’t re-pot your plant until it’s healthy so it can adjust to its new home and survive the transfer. A pale sansevieria doesn’t necessarily mean that the plant will die. It may just need some water and care and you can bring it back to life! Sansevieria are very susceptible to rotting out, especially if they sit in water for too long. Choose a pot that has good drainage, like a terra cotta pot or a pot made with another porous material so your snake plant isn’t at risk of rotting. Porous materials include terra cotta, clay, timber, paper pulp, and other natural materials that allow moisture to move through them. Snake plants don’t require too much water, and their roots can actually be damaged if they’re allowed to soak in soil that is full of moisture. To allow for good drainage and a healthy root system, choose a free-draining soil mix or even a soilless potting mixture. Place your sansevieria into the potting mixture and cover it with enough to hold it secure in the pot.  Many potting mixes that you can purchase from gardening stores are designed to help control moisture and improve drainage. Check the packaging for information on the potting mix. Use a soilless potting medium like vermiculite, peat moss, or perlite. When you’re ready to re-pot your snake plant, take a firm hold of the base of the leaves, where they connect to the soil. Gently slide the plant out of its pot.  Don’t shake any dirt loose from the roots. Be careful not to yank or jerk the plant or you could separate the leaves from the roots and kill the plant. Move the plant to its new pot and add enough soil or soilless mixture to support the plant and keep it upright. Add more soil mixture if the sansevieria leans to one side or is unstable in the pot.  Hold the snake plant in an upright position while you add soil to the pot. Pack the soil down by patting it with your hand to add support to the plant.

Summary:
Look for dark green leaves to make sure your sansevieria is healthy. Get a pot made out of a porous material. Choose a potting mix that allows for good drainage. Grasp the sansevieria at the base of the leaves and pull it from the pot it came in. Place the snake plant into its new pot and add soil to cover the roots.