Willow seed

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

In-game examine text: "Plant this in a plantpot of soil to grow a sapling."

It has a Grand Exchange buy limit of 200 every four hours, a high alchemy value of 9 gp, and item ID 5313.

View on OSRS Wiki

Willow Seed shows an active flip setup with a margin of +12 gp and 16,771 trades over the last 24 hours.

At the buy limit of 200 every four hours, max profit per cycle is about 2.4k gp — high margin with healthy liquidity.