Seaweed farming is a sector of aquaculture with proven history and huge potential. In the future, large-scale marine seaweed farms could serve simultaneously as raw material sources for biofuel and aquatic animal feed, and provide food for the world’s growing human population. IMTA development will advance our knowledge of how to farm seaweeds and use seaweed products. Will seaweed be known as an “ocean vegetable”? Be realistic today, but remain farsighted about future possibilities.