Bog rice seeds
Where to find it: The Boardwalk (Deckhand; Clawhand), Cabin Coast (Deckhand), Pirate's Pier (Deckhand; Clawhand), The Lighthouse (Clawhand), Shipwreck Isle (Clawhand), Skull Isle (Clawhand).
“Plant them on your island (Harvesting 70). They grow bog rice, and give their seeds back.”
Dropped by
Grows
Plant it on your island's plots (Harvesting 70): ready in about 300 minutes, logged in or not.
EastScape Wikibuilt from the game itself