Mankai Duckweed
Wolffia Globosa
Wolffia globosa, commonly known as Mankai Duckweed, is a unique aquatic plant celebrated for its nutritional value and rapid growth. Originating from freshwater habitats, it is often cultivated for its edible properties and is a fascinating addition to aquariums and ponds.
Everything it needs
9 essentials at a glance
Watering
Wolffia globosa thrives in consistently moist conditions.
Ensure the water level is maintained at around 1-2 inches above the substrate. In warmer months, check water levels daily, while in cooler months, every few days may suffice. Signs of over-watering include a foul odor and algae growth, while under-watering may cause the plant to wilt and turn brown.
Light
This plant prefers bright, indirect light but can tolerate low light conditions.
Ideally, it should receive 12-14 hours of light daily. Direct sunlight can scorch the leaves, so placing it near a window with filtered light is best.
Soil
Wolffia globosa benefits from a nutrient-rich, well-draining substrate.
A pH range of 6.0 to 7.0 is ideal. A mixture of aquatic plant soil or a combination of peat and perlite works well to ensure proper drainage while retaining moisture.
Humidity
This aquatic plant thrives in high humidity levels, ideally above 60%.
To increase humidity, consider using a humidity tray or misting the surrounding area. Signs of humidity stress include browning edges and wilting.
Temperature
Wolffia globosa prefers temperatures between 70°F to 85°F (21°C to 29°C).
It is not frost-tolerant and should be kept in hardiness zones 9-11. Protect it from extreme heat by providing shade during the hottest part of the day.
Fertilizing
Use a balanced liquid fertilizer with an NPK ratio of 10-10-10, diluted to half strength.
Fertilize every 4-6 weeks during the growing season. Signs of nutrient deficiency include yellowing leaves and stunted growth.
Pruning
Pruning is minimal; however, remove any dead or decaying plant material to maintain water quality.
Use clean scissors to snip away unhealthy portions. Regularly thinning out dense growth can also promote better light penetration.
Repotting
Repotting is not typically necessary as Wolffia globosa grows in water.
However, if the water becomes too murky or the substrate degrades, change the water and refresh the substrate. Signs it needs attention include poor growth and algae buildup.
Propagation
Propagation is primarily through vegetative means.
Simply separate the small plantlets that form on the surface of the water. This can be done at any time of the year, but spring and summer are optimal for faster growth.
When it's unhappy
Yellowing leaves
Why it happens
This can be caused by nutrient deficiency or poor water quality.
How to fix it
Ensure regular fertilization and maintain clean water conditions.
Algae growth
Why it happens
Excess nutrients in the water can lead to algae blooms.
How to fix it
Change the water regularly and avoid over-fertilizing.
Wilting
Why it happens
Wilting can occur due to low water levels or insufficient humidity.
How to fix it
Check water levels and increase humidity if necessary.
Brown edges
Why it happens
This is often a sign of low humidity or water quality issues.
How to fix it
Increase humidity and ensure the water is clean and fresh.
Stunted growth
Why it happens
This can result from inadequate light or nutrient deficiency.
How to fix it
Provide adequate light and regular fertilization.
Care through the year
Spring
In spring, increase light exposure as days lengthen and monitor water levels closely as growth accelerates.
Summer
During summer, ensure the water temperature remains stable and provide shade during extreme heat to prevent stress.
Fall
In fall, continue regular maintenance but prepare for cooler temperatures by monitoring the water temperature.
Winter
In winter, reduce feeding as growth slows and ensure the plant is kept in a warm environment to prevent cold damage.
Toxicity & Safety
Wolffia globosa is considered non-toxic to pets and children. It is safe for consumption and is often used in culinary dishes.
Good to know
How often should I change the water for Wolffia globosa?
Change the water every 1-2 weeks to maintain optimal growth and prevent algae buildup.
Can Wolffia globosa survive in low light?
Yes, it can tolerate low light but will grow best in bright, indirect light for optimal health.
Is Wolffia globosa edible?
Yes, Wolffia globosa is edible and is often used in various culinary dishes for its nutritional benefits.
What temperature is best for Wolffia globosa?
The ideal temperature range is between 70°F to 85°F (21°C to 29°C) for optimal growth.
How can I propagate Wolffia globosa?
Propagation is done by separating the small plantlets that form on the water's surface, which can be done at any time.
Why are my Wolffia globosa leaves turning brown?
Brown leaves may indicate low humidity or poor water quality. Ensure the water is clean and humidity levels are adequate.
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