Seaweed is a type of flora in Club Penguin. It can be seen in Aqua Grabber (underwater) and in Pizzatron 3000 to make vegetarian pizzas. It can also be bought as an Igloo furniture item. How they survive in such a cold temperature climate such as Antarctica is unknown, however, it is possible that it is imported from someplace else. Seaweed can also be seen in Ice Fishing. In Candytron 3000, Licorice replaced it.
- In Mission #6, an agent must use a Vegetarian Seaweed pizza to distract Herbert P. Bear.
- Seaweed is one of the most common flora on Club Penguin Island.