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Marimo Moss Ball
BeginnerAegagropila linnaei
Spherical algae famous as a natural monument of Lake Akan, Hokkaido. Simply sink in tank. Rolling maintains shape. Extremely slow growing but can live for decades.
About
Marimo (Aegagropila linnaei) is a green alga in the family Pithophoraceae with an unusual growth habit in which filamentous strands aggregate into a ball. In Japan, the large spherical marimo of Lake Akan in Hokkaido is famous as a Special Natural Monument, though most specimens in the trade are hand-rolled, cultivated balls. It grows by photosynthesis, prefers low light and cool water, and needs no CO2 or fertilizer. Easy to keep and beginner-friendly, it is sensitive to sustained high temperatures (above ~28°C), strong direct light, and accumulated debris, which cause discoloration or breakup. Roll it gently and periodically to maintain its shape, and watch for rising temperatures in summer. Lightly squeezing it during water changes helps expel internal debris. It is easy to keep alongside small livestock such as shrimp and medaka, and is also popular in bottle aquariums.
Basic Info
Origin
Cool lakes of the Northern Hemisphere (Japan, Northern Europe, etc.)
Size
2-15cm (ball diameter)
Temperature
15〜25℃
Watering & Fertilizer
None needed. Trace elements in water suffice
Growing Tips
Temperature
Heat-sensitive. Keep below 25°C recommended
Maintenance
Roll occasionally to maintain shape. Gently squeeze during water changes
Lighting
Low light OK. Avoid direct sunlight
Marimo Moss Ball FAQ
QWhat is the growing difficulty level for Marimo Moss Ball?
Beginner. A variety suitable for beginners. No special equipment or experience is required—you can grow it without problems by setting up a basic cultivation environment.
QWhat is the ideal temperature for Marimo Moss Ball?
The ideal temperature for Marimo Moss Ball is 15〜25℃. Avoid sudden temperature changes and maintain a stable environment.
QHow large does Marimo Moss Ball get?
The mature size of Marimo Moss Ball is 2-15cm (ball diameter). This may vary slightly depending on cultivation environment and individual differences.
QHow should I water and fertilize Marimo Moss Ball?
Marimo Moss Ball: watering & fertilizer — None needed. Trace elements in water suffice. Aim for appropriate frequency and amount.
QWhat is the typical price for Marimo Moss Ball?
The price of Marimo Moss Ball varies significantly by variety, characteristics, size, and lineage. Please check ボタちょく's price guide for the latest market information.
Last updated: June 24, 2026
References & Sources
Edited & verified by: BoTachoku Editorial Team
The classifications, regulations, and growing data on this page are created and verified based on the primary information database below.
Primary sources
Taxonomy & Authority
Accepted name: Aegagropila linnaei Kützing
Authority databases: GBIF
Nomenclature follows global taxonomic authority databases.
Regulations & Conservation Status
Sources: 環境省 特定外来生物等一覧(外来生物法) / CITES Appendix II 植物掲載分類群(科・属レベル)
Regulations may change. Always verify the latest information with the relevant authorities.
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