DIYPicks

Best Lawn Fertilizers (2026)

By The DIYPicks Team · Updated July 2026

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Feeding the lawn is the single biggest lever on color and thickness. We picked a fast synthetic for quick green-up and a gentle organic option that won't burn, so you can match the fertilizer to your grass and how much mowing you want.

1

Scotts Turf Builder Lawn Food (38-0-4)

4.6$25~$24-28 for 12.5 lb bag (covers ~5,000 sq ft); larger bags cover 12,000-15,000 sq ft

The default pick for feeding an established lawn. High-N, cheap per square foot and forgiving on grass type, but skip it for brand-new seed and always follow the bag's spreader rate.

  • Lawns

Pros

  • High nitrogen greens up and thickens all common grass types quickly
  • All-in-one formula labeled for any season and every grass type
  • Widely stocked with clear spreader settings printed on every bag

Cons

  • 0% phosphorus, so it won't feed a new seedbed that needs starter P (buy a starter formula instead)
  • Must be applied at label rate and watered in, or you risk streaking and tip burn
  • Synthetic-only; adds no organic matter for long-term soil improvement
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2

Milorganite Slow-Release Nitrogen Fertilizer (6-4-0, 2.5% Iron)

4.7$20~$18-22 for 32 lb bag (covers ~2,500 sq ft)

A slow, gentle organic lawn-and-garden feed. The iron gives a lasting green without mowing every three days, and it never burns; you just carry heavier bags for the same coverage.

  • Lawns
  • Organic
  • Gardens

Pros

  • 2.5% iron deep-greens the lawn without the surge of top growth from high-N synthetics
  • Slow-release and non-burning; no watering-in required after spreading
  • Organic nitrogen feeds soil life and is safe around kids and pets once applied

Cons

  • Low 6-4-0 analysis means heavier bags and more product per 1,000 sq ft
  • 0% potassium, so pair with a K source for stress and winter hardiness
  • Mild odor right after spreading until it is watered in or rained on
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Frequently Asked Questions

How often should I fertilize my lawn?
Most cool- and warm-season lawns want feeding 2 to 4 times a year, spaced 8-10 weeks apart during active growth. Always follow the bag's rate and local extension timing rather than feeding more often for faster results.
Do I need to water in lawn fertilizer?
Synthetic granular feeds like Scotts Turf Builder should be watered in to move nutrients to the roots and reduce burn risk. Milorganite is non-burning and does not require watering in, though rain or irrigation still helps it start working.