Giant kelp and bull kelp are indigenous to cold, shallow, sunny waters along the Pacific coast, from Alaska to Baja California, Mexico. Bull kelp are more common in the northern part of the range. Giant kelp outcompete their sister species starting around Central California.

Photograph by Helen Madrid, MyShot
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Kelp is a giant seaweed that grows in two forms along the west coast of North America—giant kelp and bull kelp.