What Is NPK: Understanding Those 3 Numbers on Fertilizers
Because lawns are all about lush green growth, they need a lot of nitrogen so it's best to use a fertilizer with a higher first number in the formulation. A fertilizer with an NPK ratio of 3-1-2 or 4-1-2 is great for most lawns. The best NPK for trees and shrubs. A fertilizer with an NPK ratio of 2-1-1 or 3-1-1 works for most trees and shrubs.
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