Fish Emulsion Fertilizer, 5-1-1 Formula, 1-GallonFish Emulsion is the fast action plant starter for the cold early months. It is a liquid, organic based fertilizer made from byproducts of the fish oil and fish meal industry. Fish emulsion is appropriate for many uses in the garden, but is especially useful as a lawn fertilizer in early spring and to feed leafy green vegetables, due to its higher nitrogen content. Fish emulsion is a concentrate, which you dilute and apply to your lawn or garden.