Discover the Charm of Marimo - Japan's Iconic Moss Ball

Discover the Charm of Marimo - Japan's Iconic Moss Ball

執筆者: Hideo Takahashi

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読む時間 3 min

In the world of Japanese cultural symbols, one might not immediately think of a humble plant. Yet, marimo , also known as "moss balls," holds a cherished place in Japanese culture and beyond. These velvety green spheres have captured the fascination of many for their beauty, simplicity, and the rich history they bring along. Let's explore what makes marimo so special and why they're treasured by enthusiasts around the world.

What exactly is a Marimo?

The name "marimo" comes from the Japanese words mari (ball) and mo (algae). These remarkable green spheres are not just moss but actually a rare form of algae that naturally forms into round, soft balls. Found primarily in freshwater lakes, marimo are shaped by the gentle rolling currents, which help maintain their spherical form. Known for their slow growth rate, these algae balls expand about five millimeters a year, making them an ideal low-maintenance plant for aquariums and home decor.

The Cultural Significance of Marimo

Marimo are more than just plants; they are cultural icons in Japan, symbolizing good fortune and love. Their slow, steady growth and perfect spheres represent patience and dedication. This symbolism makes them popular gifts, especially for those embarking on new journeys or celebrating significant milestones. At Lake Akan in Hokkaido, marimo are especially revered, with local folklore associating them with spiritual significance.

Origin and Natural Habitat of Marimo

Lake Akan, located in the northern region of Hokkaido, is perhaps the most famous home of the marimo. Here, they grow in large colonies, and local indigenous Ainu people traditionally view them as spiritual beings with deep connections to nature. This lake provides an ideal habitat, offering the cool, clean waters that marimo thrive in.

Marimo can also be found in other parts of the world, such as Lake Mývatn in Iceland. However, these habitats are under threat due to climate change and pollution, sparking conservation efforts to protect these unique plants.

How to Care for Your Marimo

If you're considering adding a marimo to your home, you'll be glad to know they're incredibly easy to care for. Marimo thrive in cool water with indirect light. Ensure the water remains between 59-68°F, and change it bi-weekly to keep your marimo healthy. They don't require soil—simply place them in a jar or aquarium. To maintain their shape, gently roll them by hand occasionally.

Marimo can live for decades, even surpassing 100 years with proper care. In aquariums, they help filter water by absorbing nitrates, contributing to a healthier environment for fish and other aquatic life.

Conservation Status

Despite their popularity, wild marimo populations face threats from rising water temperatures and pollution. In Japan, Lake Akan's marimo population has suffered due to these environmental changes. The annual Marimo Festival at Lake Akan raises awareness and promotes conservation efforts to protect these beloved plants.

In Iceland, marimo are considered endangered, with efforts underway to study and preserve this unique species. Without intervention, marimo could become rare in regions where they once flourished abundantly.

Why Own a Marimo?

Owning a marimo brings beauty, tranquility, and a touch of Japanese culture to any space. In addition to their symbolic meanings of love, luck, and longevity, marimo improve water quality by filtering nitrates. Their ecological benefits and low-maintenance care make them appealing for anyone looking to add a bit of nature to their home.

By choosing to own a marimo, you support conservation efforts. Most marimo sold commercially are sustainably grown, helping to raise awareness about the importance of preserving these unique plants.


Whether you’re drawn by their aesthetic charm, cultural significance, or environmental benefits, marimo are a delightful addition to any home. Experience the joy of owning a piece of nature with rich history and meaning. Have you had any experiences with marimo? Share your stories and join us in our efforts to protect these incredible plants for future generations.

Author Bio

Hideo Takahashi

Hideo Takahashi

Born in Tokyo in 1990. Founder of JAPANBITE and CEO of its operating company, GRID Start, Ltd.
Established the company in 2023 after being an IT engineer.
Inspired by his travels to 15 countries and a deep love for Japanese food, he launched a service to contribute to small local Japanese manufacturers' businesses and allow many foreigners to enjoy Japanese culture.

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