Guam seed

Guam Seed is a members-only item on the OSRS Grand Exchange in the seeds category.

In-game examine text: "A guam seed - plant in a herb patch."

It has a Grand Exchange buy limit of 600 every four hours, a high alchemy value of 1 gp, and item ID 5291.

View on OSRS Wiki

Guam Seed shows an active flip setup with a margin of +1 gp and 18,734 trades over the last 24 hours.

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