Tall Fescue Fertilizer & NPK Guide
Fescue needs 2-3 lbs of nitrogen per 1,000 sq ft per year. Target a 4-1-2 NPK ratio (e.g., 16-4-8). The heaviest applications go in FALL — September through November is when fescue grows most aggressively. Apply 1 lb N/1,000 sq ft in September and another 1 lb in November. A light spring application (0.5 lb N) in April is optional. DO NOT fertilize in summer — excess nitrogen during heat stress fuels brown patch disease. Get a soil test before your first application to identify deficiencies and avoid over-applying phosphorus or potassium.
Frequently Asked Questions
When should I fertilize fescue?
September: heaviest application (1 lb N/1,000 sq ft). Late October/November: second application. Early spring: light application (0.5 lb N). Summer: zero nitrogen.
Why no nitrogen in summer?
Summer nitrogen pushes leaf growth during heat stress, weakening the plant. Worse, excess nitrogen in warm humid conditions is the #1 trigger for brown patch disease in fescue.
What fertilizer should I use on fescue?
A 4-1-2 ratio like 16-4-8 works well. Slow-release nitrogen is preferred for spring applications. Fall applications can use quick-release for faster response during peak growing season.
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