Sugar kelp has similar qualities to normal kombu. While the white powdery substance on dried kombu (laminaria ochroleuca) is predominantly made up of sodium based minerals, the coating on sugar kobmu has a greater quantity of the sugary substance mannitol, which lends its distinctive sweetness. Sugar kelp is found in the extreme lower shore and in gullies and rock pools. It has a small holdfast and very short thin stipe which is less than 60cm long and can be easily torn off rocks in stormy weather. It can be sustainably harvested from Spring to autumn.