While String of Hearts (Ceropegia woodii) typically grows in dry, rocky soil in its native habitat, the plant can survive in water. If you have overwatered your String of Hearts and the roots are waterlogged, you can try transplanting the plant to a pot with well-draining soil. Alternatively, you can cut off the bottom portion of the stem and place it in a glass of water. The stem will eventually produce roots and new leaves, and you can then transplant it into a pot.