- 1). Look at the plants to determine their identity. In order to control the plants, you must first figure out what type they are. Look at the leaves above and below the water and any flowers they contain. If you cannot determine the identity yourself, take a sample of the plant to a local extension and ask an associate for help.
- 2). Treat the pond with herbicides to stop plant growth. A variety of products are on the market to reduce vegetative growth in ponds. Read the products' labels for instructions on how to use them, as they vary per herbicide and depend on the size of your pond. In addition, look on the bottle to make sure it works on the type of vegetation that is in your pond. Some states require permits for pond herbicidal use; therefore, check with your local extension or Department of Wildlife before you use them.
- 3). Place a triploid grass carp inside your pond. This sterile fish eats submerged aquatic vegetation and will keep the growth in your pond at bay. You may need to obtain a permit before you can purchase such a fish; therefore, check with your local extension. The extension may also be able to provide you with the fish as well.
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