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Marimo (毬藻, literally "ball seaweed"), also known as Cladophora ball, Lake ball, or Moss Balls in English, is a species of filamentous green algae (Chlorophyta) found in a number of lakes in the northern hemisphere. A marimo is a rare growth form of the species where the algae grow into large green balls with a velvety appearance. Colonies of such balls are only known to form in Iceland, Scotland, Japan and Estonia.

Care for Domestic Marimo

Marimos in lake Akann, Japan

Domestic marimo grow in tap water at room temperature as long as the water is changed every one or two weeks (more frequently in summer and less often in winter). The marimo can be placed in the refrigerator in hot weather (above 25°C), but does not survive freezing. Photosynthesis occurs in normal household lighting, otherwise, indirect sunlight since the marimo is adapted for low light conditions only. If the marimo green color turns brownish it may recover without intervention, otherwise a very minimal amount of salt can be added as a suggested remedy.

YUI's relation with marimo

She got two marimos as a present back in 2005[1][2]. It's believed that this triggered her liking for Marimokkori