Rockweed

Rockweed may refer to:
 * Ascophyllum nodosum, a seaweed also known as knotted wrack or Norwegian kelp
 * Fucus gardneri, a similar seaweed also known as bladderwrack
 * Fucus vesiculosus, a similar seaweed also known as bladderwrack
 * Pilea microphylla, a vascular plant native to Florida
 * Silvetia, a common brown seaweed of Pacific Ocean rocky seashores