This disclosure describes a cutting unit for cutting sphagnum moss. The unit comprises a first pair of substantially parallel blades, laid out substantially according to a first orientation, and spaced apart from about 2 cm to about 30 cm and a second pair of blades, substantially parallel, laid out substantially in a second orientation, and spaced apart from about 40 cm to about 400 cm. The blades of the first pair and second pair being positioned and configured to cut said sphagnum moss.