Plant
Algae comprise several different groups of organisms which produce food by photosynthesis and thus have traditionally been included in the plant kingdom. The seaweeds range from large multicellular algae to single-celled organisms and are classified into three groups, the brown, red and green algae. There is good evidence that the brown algae evolved independently from the others, from non-photosynthetic ancestors that formed endosymbiotic relationships with red algae rather than from cyanobacteria, and they are no longer classified as plants as defined here.
Seaweed cultivator
The type of seaweed that can be grown in a seaweed cultivator is currently limited to green types, mostly Angel Hair and sea lettuce, because other types such as Nori require more complex control of the water temperature and other variables. Angel Hair and sea lettuce, however, can be grown at home at room temperature.