Description
Spirodela polyrrhiza, commonly known as "Giant Duckweed," is a floating plant that is found in freshwater environments nearly worldwide. As the name suggests, it is significantly larger than the common duckweed (Lemna minor), with leaves (fronds) that can reach up to 1 cm in diameter. A striking feature of this plant is the underside of the leaves, which often turns a deep, attractive red colour.
It is an excellent addition to open aquariums and breeding tanks, as its long, hanging roots provide perfect shelter for fry and shrimp. Because it is larger than standard duckweed, it is much easier to manage and remove if it spreads too aggressively. It is also a "nutrient sponge," effectively removing excess nitrates and phosphates from the water column, which helps prevent algae growth.
Plant Profile:
· Genus: Spirodela
· Species: polyrrhiza
· Family: Araceae
· Origin: Cosmopolitan (found worldwide)
· Light: Low - High
· Temperature: 15-30°C
· Growth Rate: Very Fast
· Placement: Floating
· Height: Roots 3-5+ cm
· pH: 5-8
· Water Hardness: Soft to hard
· CO2: 0-10 mg/l (Accesses atmospheric CO2)
· Propagation: Division (budding)
· Difficulty Level: Easy (Beginner)
