Four-stamen watermilfoil

Four-stamen watermilfoil (Myriophyllum tetrandrum) is a perennial aquatic herbaceous plant belonging to the Haloragaceae family. It is a highly specialized hydrophyte known for its rapid biomass production and its significant role in managing nutrient-rich freshwater environments.

Native to parts of Southeast Asia and Australia, this species thrives in slow-moving water bodies. In agricultural practice, it is increasingly recognized for its utility in managed wetlands and specialized aquaculture facilities where controlled growth is required for water treatment or horticultural purposes.

Botanically, the plant is characterized by whorled, finely pinnate leaves that grow along slender, fragile stems. This structural adaptation allows the plant to maximize nutrient absorption directly from the water column. It propagates primarily through vegetative fragmentation, where stem sections can easily root in substrate to form new colonies.

Successful cultivation requires specific environmental parameters, including nutrient-rich sediment and moderate light exposure. The plant prefers water temperatures between 18°C and 26°C. Agrotechnical management focuses on regulating the growth density to ensure water circulation, as excessive growth can lead to hypoxic conditions in stagnant environments.

• Maintenance of proper water alkalinity.
• Regular thinning to prevent overgrowth.
• Monitoring of nutrient levels (N and P).
• Substrate stabilization in ponds.

The primary economic uses of this culture include biofiltration in wastewater treatment systems and its role as a nursery plant for fish farming. By absorbing excess nutrients, it helps maintain water clarity and health, while its complex structure provides essential habitat for various aquatic microfauna, supporting the overall biodiversity of the system.