Organic Fertilization Schedule for Kentucky Bluegrass in St. Louis

You’ve managed organically for four years (beneficial nematodes for grubs). Mow high, irrigate twice weekly. Currently fertilize once in early April with lime. Want a full organic schedule and product types.

Understanding Organic Fertilizers

“Organic” here means derived from plant/animal matter (manure, meals, compost). They improve soil structure and biology over time, but nutrient release is slow and variable.

Suggested Schedule (Cool-Season Bluegrass)

Key Practices

• Soil test every 2–3 years; adjust pH with lime only if needed (target 6.2–6.8).
• Core aerate annually before fall topdressing.
• Leave clippings; they return ~1 lb N/1,000 sq ft/year.

Your local University of Missouri Extension office has Missouri-specific organic lawn guides.