Hygrophila is a prolific exotic originally from the East Indies. It is mostly submersed, but a small portion of the plant may extend above the water surface. Leaves are opposite, elliptic to oblong, entire, and 1 1/2 inch long and 1/2 inch wide. Stems are square and grow up to 6 feet. Flowers are white to bluish-white and located in the axils of upper leaves.
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Law requires individuals to possess a Commercial Pesticide
Applicators License in Category 5, Aquatic Pest Control, before they
apply aquatic herbicides if the work is done for compensation on the
property of another. A license is also required, regardless of
ownership, if the application is made to an area where public access
to the treated site is expected. Private swimming lakes, where the
public would exposed to the treated waters, are the most obvious
example of the latter requirement. On all public facilities, such
as golf courses, driving ranges, subdivisions, condominium/apartment
complexes and mobile home parks, applicators are required to possess
a Category 5 License to apply aquatic pesticides.