Sphagnum peat moss is the upper residue found in acid peat bogs. It has been exposed to limited decomposed compared to peat moss. Coarse sphagnum is used most often in air layering because it has good water holding capacity and air porosity.
Shredded sphagnum is a good medium for seed germination. It has fungistatic properties and has been shown to reduce damping off diseases. Its major drawback is that it is expensive relative to other media components.