Cool Season Fertilizer Program
Without a soil test, use a 4-1-2 ratio (N-P-K) such as 16-4-8. PGF Complete 16-4-8 is the recommended primary base fertilizer — mild, slow release, ideal ratio, tiny particles for best distribution, contains iron, micronutrients, and Humic DG. You feed the SOIL, not the plant. The plant draws what it needs. Excess nutrients do NOT improve results and can cause harm (e.g., high phosphorus locks up other nutrients). Only vary fertilizer numbers when soil test shows excess/deficiency or for seasonal timing.
Frequently Asked Questions
What is the 4-1-2 NPK ratio?
The 4-1-2 ratio means four parts nitrogen, one part phosphorus, and two parts potassium. A fertilizer like 16-4-8 follows this ratio. It provides balanced nutrition for cool-season grasses.
How much fertilizer should I apply per year?
Cool-season lawns typically need 3-4 pounds of nitrogen per 1,000 square feet per year, split across multiple applications. The heaviest applications should be in fall.
When should I fertilize my cool-season lawn?
The most important application is in fall when grasses are growing vigorously. A lighter spring application helps green-up. Avoid heavy fertilizer in summer to prevent stress.
Should I use slow-release or quick-release fertilizer?
A blend of both works best. Slow-release provides steady feeding over weeks, while quick-release gives an immediate boost. Most quality lawn fertilizers include both types.
Do I need a separate phosphorus application?
Only if your soil test shows a phosphorus deficiency. Many states restrict phosphorus in lawn fertilizers due to water quality concerns. Always test before adding extra phosphorus.
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