Don’t let your String of Hearts sit in water, as it’s prone to root rot. If your plant is sitting in water, pour away the excess and let the soil dry out. While the plant likes a sunny spot, make sure it’s not in full, direct sunlight in summer. A little burst of sunshine early or late in the day is good.
Don’t be alarmed if you don’t see much growth during the winter months. It is normal to slow down at this time of year, and the stems will remain roughly the same length. When spring and summer come around, it’ll start to grow again.