2-3-1. Neptune’s Harvest Organic Fish/Seaweed blend fertilizer gives you the best of both fish and seaweed with a perfect blend of fish hydrolysate and seaweed, ensuring a complete fertilizer program Growers using our fish/seaweed blend fertilizer on a regular basis have reported increased marketable yields and improved shelf life on fruits & vegetables. Fish and seaweed are known to build the natural sugars in plants. Flowers and foliage will be stronger and more colorful. Blooms will be more plentiful, fragrant and longer lasting.