Marimo (Cladophora aegagropila) is actually a variety of fresh water algae that grows into a ball. The spherical shape is caused by tumbling on lake bottoms. Propagating marimo is easy, and caring for the newly propagated marimo is simple as well.
Marimo moss balls are not actually moss, but instead, a type of green algae usually found in lakes. These quirky aquatic plants can make for a unique living water garden that will catch the attention of friends and family.