In the ocean as well as in rivers, lakes, and other water bodies.
Save. Jupiterimages/liquidlibrary/Getty Images. Seaweed is a large variety of algae that grows in both fresh and salt water. Some seaweeds are edible and can be used in plant fertilizer or medicines. It is possible to grow your own seaweed at home in a large aquarium using salt water you make on the stove. Leave the aquarium in a sunny spot so the seaweed will grow properly. Seaweed is the common name for countless species of marine plants and algae that grow in the ocean as well as in rivers, lakes, and other water bodies. Kelp forest in the Channel Islands National Marine Sanctuary and National Park. Some seaweeds are microscopic, such as the phytoplankton that live suspended in the water column and provide the base for most marine food chains. Some are enormous, like the giant kelp that grow in abundant “forests” and tower like underwater redwoods from their roots at the bottom of the sea. Seaweed is a plant that grows in the sea. There are thousands of different kinds of seaweed all over the world. Like plants that are grown on land, some seaweeds are also farmed to give you both food and money.
http://www.ehow.com/how_8710896_grow-seaweed-home.html http://oceanservice.noaa.gov/facts/seaweed.html http://www.fao.org/docrep/field/003/AC287E/AC287E01.htm
where does seaweed grow