Neptune’s Harvest Fish And Seaweed Fertilizer 2-3-1 is a perfect blend of fish hydrolysate and seaweed, ensuring a complete fertilization program. Growers using this fish and seaweed blend fertilizer on a regular basis have reported increased marketable yields and improved shelf life on fruits and vegetables. Fish and seaweed are known to build the natural sugar in plants. Flowers and foliage will be stronger and more colorful. Blooms will be more plentiful, fragrant and longer lasting. OMRI listed.