Fertilizer (肥草水, Koe Sōsui, lit. "Sousui Fertilizer") is a story item found in Legend of Legaia. It is found in West Voz Forest and has the power to speed up the growth of certain plants. When the Ra-Seru heroes find the Bridge Grass, Noa suggests using the Fertilizer on it to speed its growth. After pouring it on the Bridge Grass, it grows in mere seconds and spans the gorge in front of it, enabling the heroes to get to the other side of the forest.