Seaweed spore

Seaweed Spore is a members-only item on the OSRS Grand Exchange in the ores category.

In-game examine text: "A seaweed spore - plant in a seaweed patch."

It has a Grand Exchange buy limit of 600 every four hours, a high alchemy value of 12 gp, and item ID 21490.

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Seaweed Spore shows an active flip setup with a margin of +35 gp and 35,353 trades over the last 24 hours.

At the buy limit of 600 every four hours, max profit per cycle is about 21.0k gp — high margin with healthy liquidity.