Organic, All-Natural & Non-GMO Sourced Asparagus Fertilizer (4-3-1)! The Urban Farmer Asparagus Fertilizer will increase asparagus yields, size, health and taste. This 4-3-1 (NPK) fertilizer ratio is specially formulated to get the most out of your asparagus. This fertilizer gives the asparagus exactly what it needs at the right time. Our asparagus fertilizer also contains several other beneficial vitamins, minerals and microbes for improving soil health. Directions: Use 1 cup of asparagus fertilizer