Controlling Duckweed – How To Kill Duckweed

by johnah on November 2, 2020

Controlling Duckweed – How To Kill Duckweed

The best way to control duckweed is to use will salt or will roundup. Both are effective methods of killing duckweed. Salt kills the plant while roundup kills all its leaves and stems. There are other chemicals which can be used against duckweed but they do not work as well as these two chemicals.

Duckweed is a weed that grows naturally in many areas. It spreads easily through wind and water currents. It prefers moist soil and it produces new growth every year. You may have seen some of the weeds growing around your house or yard. They are called Duckweeds because they look like ducks when they fly over the surface of the ground and then sink into the earth again to lay their eggs on top of the soil.

You may think that duckweed is harmless but it is actually very harmful to plants. When the plant grows up to three feet high, it causes damage to nearby crops such as tomatoes, potatoes and beans. It also damages trees and shrubs by spreading roots underneath them causing them to fall down. If left unchecked, duckweed can spread throughout your garden and even cause problems in neighboring homes.

If you find duckweed in your yard and garden, then it is important that you take immediate action to get rid of it. You can use will salt or will roundup to get rid of this weed. However, these are chemicals and need to be used with proper care. Always read the instructions on the product labels before using them.

You can apply the salt directly on the leaves of the duckweed. You should use a spray bottle to spray salt water.

Sources & references used in this article:

Control of euglenophyte bloom and fish production enhancement using duckweed and lime by MS Rahman, M Shahjahan, M Haque, S Khan – Iranian Journal of Fisheries …, 2012 –

Use of duckweed, Spirodela polyrrhiza L. Schleiden, as a protein feedstuff in practical diets for tilapia, Oreochromis niloticus L. by EA Fasakin, AM Balogun, BE Fasuru – Aquaculture Research, 1999 – Wiley Online Library

Developmental control of apiogalacturonan biosynthesis and UDP-apiose production in a duckweed by JM Longland, SC Fry, AJ Trewavas – Plant physiology, 1989 – Am Soc Plant Biol

Managing water quality with aquatic macrophytes by J Srivastava, A Gupta, H Chandra – Reviews in Environmental Science …, 2008 – Springer

Waste water recycling by duckweed for protein production and effluent renovation by G Oron, LR Wildschut, D Porath – Water science and technology, 1985 –

An evaluation of duckweed-based pond systems as an alternative option for decentralised treatment and reuse of wastewater in Zimbabwe by I Nhapi, J Dalu, J Ndamba, MA Siebel… – Water science and …, 2003 –

The Lemnaceae, or duckweeds by WS Hillman – The Botanical Review, 1961 – Springer

Growth characteristics of aquatic macrophytes cultured in nutrient-enriched water: II. Azolla, Duckweed, and Salvinia by KR Reddy, WF DeBusk – Economic Botany, 1985 – Springer



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