Kelp forests occur in cold, nutrient-rich water and are among the most beautiful and biologically productive habitats in the marine environment. A dependence upon light for photosynthesis restricts them to clear shallow water and they are rarely much deeper than 20 to 80 feet.
Giant kelp is one of the fastest growing plants in the world. When conditions are good, kelp can grow two feet per day! Giant kelp prefers water temperature in the 50-65 degree (F) range. A giant kelp plant can live up to six years. The plant is continuously pushing up new fronds to the surface, while the older fronds break off. Reaching lengths of more than 100 feet, it is the largest marine algae.