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How To Control Fanwortfanwort

There are a wide variety of aquatic weeds that can intrude upon a lake or pond. One such invader is known as fanwort and when growing in large numbers, can make a lake or pond look aesthetically displeasing as well as being a threat to recreational activities like swimming and fishing. The first step of controlling an aquatic weed is learning a little bit about it before proceeding with a control program.

Fanwort (cabomba carolina) is a submerged plant that roots on the bottom of lakes and rivers.  Fanwort plants can be found in Ireland, the waters of Asia and Australia as well as in the Central Ontario region of Canada in the Crowe River and water in the northern United States. Fanwort tends to thrive in waters that are acidic.

Under the water, pairs of finely divided, fan-shaped leaves grow on opposite sides of the main stem, creating a feathery effect. The fanwort plant also has small floating oblong leaves up to three centimeters long. Fanwort flowers from late spring to early fall. The flowers usually rise above the surface of the water. They are 0.6 to 1.5 centimeters wide and can be colored white to pale yellow, sometimes with a pink or purple tinge.

Fanwort is a fast-growing plant and forms thick mats that crowd out native plants, block sunlight to submerged plants, disrupt fish communities and clog drainage canals and streams. Because of this, they have been known to be costly to the economy. If you have fanwort growing on your body of water, Solutions Pest and Lawn is the right place to get products to eliminate this invasive species effectively.

How To Get Rid of Fanwort: 3 Step Solution

Fanwort can be quite a challenge to get rid of because it reproduces so fast. There is no biological control of this invasive species because there are no animals which want to eat the plant. Physical control by removing the plants by raking or seining fanwort but it’s largely ineffective and inefficient because if there’s a large outbreak it will take a lot of labor and fanwort will re-establish itself from any remaining roots. Chemical control is your best option and we carry not only herbicides which specifically target fanwort but we also provide helpful how-to advice so you can easily DIY. Follow our series of steps below to effectively manage fanwort.

Step 1: Before proceeding with control measures you will need to properly identify the plant to make sure that it is indeed fanwort. Fanwort looks similar to other aquatic plants, including bladderwort (Utricularia vulgaris), white-water crowfoot (Ranunculus aquatilis), northern water-milfoil (Myriophyllum sibiricum), water marigold (Megalodonta beckii) and coontail (Ceratophyllum demersum) so it can easily be confused with a different plant. If you are not sure what plant you have, send us a photo of the plant via email at identification@solutionsstores.com and we will respond with the correct ID of the weed and present you chemical options to best control it.

Step 2: Once you have correctly identified it as fanwort and carefully analyzed your pond or lake, you can than move on to chemical control by choosing an aquatic herbicide to manage the invasion. At Solutions Pest and Lawn we have a large selection of different aquatic herbicides which come in both liquid or granular forms. Liquid herbicides are a great solution because they attack weed growth in shallow water on or above the ponds surface and can be spread evenly with a pump sprayer. This makes the control process efficient and convenient to physical removal.

Granular herbicides are best another good option especially when weeds are submerged as blankets under the water surface in deep areas of the pond or in ponds with flowing water. These heavier granules can be applied with a hand spreader and will sink directly onto the weed beds. What you select is entirely up to your personal preference. You will see our recommendations below.

Step 3: Apply the the selected herbicide to your pond or lake during ideal temperatures and following the instructions carefully on the product label of the herbicide you chose. If the pond is heavily infested with fanwort, it may be possible (depending on the herbicide chosen) to treat the pond or lake in sections and let each section decompose for about two weeks before treating another section. Aeration, particularly at night, for several days after treatment may help control the oxygen depletion. There is a more detailed guide on applying weeds in our Knowledge base.

Browse our fanwort control products below. If you need any assistance with your order or any DIY advice, you can contact us directly via email, live chat or by phone and we will be happy to answer any questions you have.


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