Choosing Organic Fertilizers for Sandy, Acidic Soil (Zone 5)

Focus on NPK, Not Marketing

Compare nitrogen (N), phosphorus (P), potassium (K). Secondary/micronutrients are usually adequate in garden soil.

Product Analysis

• Milorganite (6-2-0) – Very low potassium; on sandy soil, K leaches fast. Supplement with sulfate of potash (0-0-50) at 4 lbs/1000 sq ft after each Milorganite application (35 lbs/1000 sq ft).
• Ringer Lawn Restorer (10-2-6) – Better K ratio. Apply 20 lbs/1000 sq ft, 2–3×/year. Add 0-0-50 once yearly (2 lbs/1000 sq ft).
• Garden's Alive WOW Plus, PROSTART – Check labels; avoid "bio-stimulants" without clear NPK.

Fertilization Schedule for Zone 5

Late spring (Memorial Day), early fall (Labor Day), late fall (after top growth stops, ~Halloween). Avoid summer. Late fall: use quick-release synthetic if organic too slow in cold soil.

Crabgrass Prevention

Corn gluten meal (CGM) at 20 lbs/1000 sq ft in early April suppresses crabgrass and adds slow-release N. Skip if overseeding.

Grass Seed Mix

For sun/drought: tall fescue (but don't mix with fine fescue/rye/bluegrass). For mixed conditions: quality blend of perennial ryegrass, Kentucky bluegrass, fine fescue (e.g., Scott's). Aerate annually in early September.