Seaweed

"Slimy when wet but, once dry, becomes hard and crackly."

- Description.

Seaweed is a general term used to describe various types of multicelluar algae that resemble weeds. Seaweed grew on the rocks surrounding Hut-on-the-Rock, and the smell of it was so strong it pervaded the hut itself.

Appearances

 * Harry Potter and the Philosopher's Stone
 * Pottermore