Marimo, more commonly known as moss balls, make a fun addition to your indoor garden and are a popular feature in aquariums. These aquatic plants are also relatively easy to care for once you know the basics.
Light
The good news is, marimo balls do not need a lot of light to thrive. "They don't need to be in bright sun since they naturally grow at the bottom of the lakes," says Steinkopf. "They prefer a lower light situation." The algae do not like direct sun and should not be placed near a window, as marimo can quickly turn brown if they are getting too much direct light. Keeping them out of direct sunlight and giving them plenty of low, indirect light should keep them happy.
Water
Moss balls are aquatic plants, so they must live submerged in cool water, preferably under 77°F. These plants aren't too picky about the type of water; it just has to be freshwater. "I use my tap water, but well water, distilled water, or rainwater would be fine as well," says Steinkopf. For best results, change the water every two weeks and allow the water to sit out for a day beforehand, so chlorine has a chance to evaporate. Also, clean the container with a brush if algae start to grow on the surface.
Fertilizer
Marimo does not require supplemental fertilizer! These amazing plants make their food through photosynthesis and do not need a nutrient boost to keep them thriving. They are slow-growing, so don't expect them to outgrow their tanks within a year. The plants grow up to 5 millimeters per year and will eventually reach 2 to 5 inches in containers or 8 to 12 inches in natural conditions.
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