Marimo moss ball
Aegagropila linnaei
Marimo moss ball
About this plant
Aegagropila linnaei, commonly called the Marimo moss ball, is a unique aquatic plant that forms green, velvety, round balls. It is not a true moss but a type of algae. Marimo balls are popular in aquariums and as decorative plants because of their unusual shape and soft texture. They grow slowly and can live for many years, sometimes decades. In nature, they roll gently on lake bottoms, which helps them keep their round shape.
Taxonomy
- Genus
- Aegagropila
- Family
- Cladophoraceae
- Higher classification
- Order Cladophorales
- Plant type
- Houseplant
- Lifespan
- Perennial
Origin & Distribution
- Native region
- Japan, Iceland, Scotland, Estonia
- Distribution
- Native to lakes in Japan, Iceland, Scotland, and Estonia; cultivated worldwide as aquarium plants.
Care
- Light preference
- Partial sun
- Suitable locations
- Indoor, Greenhouse
- Preferred window facing
- North-facing, East-facing, West-facing
- Watering frequency
- Moderate
- Watering interval
- 3–7 days
- Humidity
- High
- Minimum
- 5 °C
- Maximum
- 25 °C
- Optimal
- 15–23 °C
- USDA hardiness zones
- not applicable
- Soil pH
- neutral
- Soil type
- freshwater aquarium water
Watering. Change the water every 1 to 2 weeks to keep it fresh and clean. Avoid letting the water become stagnant or dirty.
Fertilizing. Usually, no fertilizer is needed if grown in clean water with natural nutrients. If grown in aquariums, occasional liquid fertilizer for aquatic plants can be used sparingly.
This plant is easy to care for and grows slowly underwater. It needs clean, fresh water and moderate light. Avoid strong water currents and keep the water temperature stable for best growth.
Propagation
- Propagation methods
- Division
- Care difficulty
- Easy
Ornamental features
- Flowering
- No
Soft, velvety green spherical shape that is visually appealing underwater.
Toxicity & Safety
- Toxic to humans
- Non-toxic
- Toxic to pets
- Non-toxic
- Weed potential
- Not considered a weed
Non-toxic to humans and pets; safe to keep in homes with children and animals.
Allergy information
- Allergy risk
- Low
- Allergy triggers
- Skin contact
- Pollen level
- None
Aegagropila linnaei is generally safe and unlikely to cause allergies. People sensitive to aquatic plants or algae should handle it gently to avoid skin irritation. It mainly grows underwater, so airborne pollen allergies are not a concern.
Common problems
If water is dirty or stagnant, the plant may turn brown or decay. Too much direct sunlight can harm it. Overhandling can damage its delicate structure.
Uses
Primarily used as an ornamental aquatic plant in aquariums and decorative water features. It is also considered a good luck charm in some cultures.
Notes
Gently roll the Marimo occasionally to maintain its round shape. Change water regularly to keep it clean. Avoid placing it in direct sunlight to prevent damage.