Neptune's Harvest FS136 32 Oz. Fish & Seaweed Blend Fertilizer 2-3-1 A perfect blend of fish hydrolysate and seaweed. Growers 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.