Since it is tradeable, you can buy it at the Grand Exchange. You can also pick it up in several places, near the shorelines - for example in Karamja, Brimhaven area.
The Seaweed span is near the fremniks, and on the Fremnik Isles.
You make Soda Ash in Runescape by simply using seaweed on a fire. (However, this process is for members only).
use seaweed on a fire and you will get soda ash used for the making of molten glass
Go to the fishing store in catherby, just off the place where everyone fishes, with a fishbowl with water + seaweed in it and talk to the owner and he will sell you one for 10gp.
seaweed seaweed seaweed
No, kale is not seaweed. Perhaps you mean "kelp" which is a seaweed.
Answer Seaweed is not an animal of the sea's it's a plant.
seaweed seaweed
No, seaweed is a plant.
Seaweed is renewable!
Seaweed? Plants.
is seaweed nonliving