100g bag of Sphagnum moss. The application of a sphagnum moss is one way to retain moisture in potted plants. Its stringy, fibrous nature makes it an environmentally friendly and attractive option for hanging baskets, terrariums etc. Sphagnum moss is commonly used when growing succulents, orchids and several indoor plants. It is light and holds moisture very well. It doesn't become overly soggy, and hence it means your plant is less likely to be bothered by root rot issues. Depending on the plant, it might be used on its own, or mixed with soil or another potting medium. On its own, waterings may need to be more frequent and fertilizers may be required as sphagnum moss does not hold much in the way of nutrients.