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The zone that would be most difficult for a plant to live in is the  Benthic zone. It is the zone at the lowest level of a body of  water.
Dead zone is a more common term for hypoxia, which refers to a reduced level of oxygen in the water. Hypoxic zones are areas in the ocean of such low oxygen concentration that animal life suffocates and dies, and as a result are sometimes called dead zones..One of the largest dead zones forms in the Gulf of Mexico every spring.ead zones occur in many areas of the country, particularly along the East Coast, the Gulf of Mexico, and the Great Lakes, but there is no part of the country or the world that is immune. The second largest dead zone in the world is located in the U.S., in the northern Gulf of Mexico.