Early fall is the best time of year to treat cattails that may have invaded your pond. Cattails can grow anywhere from 3 to 10 feet tall. In the Unites States, cattails are either the broad-leaf or narrow-leaf varieties. They reproduce by wind-dispersed seeds or through their root systems. Most cattails only require 1-2ft of water to grow to their full potential. Once the plants have established, it will be very difficult to maintain open water.
Cattails can be controlled using Glyphosate, a systemic herbicide. This product is best applied in the early to mid fall when the cattails are starting to take all of the nutrients out of their leaves to go dormant for the winter. When the Glyphosate herbicide is applied at this time, it will be taken down into the plant’s root system along with these nutrients. This will ensure that there is very little re-growth during the next season.
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