Close-up of a lawn mower cutting lush green grass outdoors.

Lawn Fertilizer Application Timing

05/13/2025 | Renewed Outdoors Admin |

Lawn Fertilizer Usage Guide

 This is a summary of the grass fertilizers available at Renewed Outdoors, along with 

recommendations on the best time and conditions for application:

1. STEP 1: 18-0-4 with Dimension

  • Description: Pre-emergent crabgrass control with 25% Fortify slow release.
  • Best Time to Apply: March or April.
  • Active Ingredients: Dimension (Dithiopyr), Nitrogen (18%).
  • Application Time: Early morning or late afternoon to avoid the heat.

2. STEP 2: 22-0-4 with Trimec

  • Description: Post-emergent weed & feed with 25% Regain slow release.
  • Best Time to Apply: Late May, June, or early July.
  • Active Ingredients: Trimec, Nitrogen (22%).
  • Application Time: Early morning or late afternoon to maximize absorption and minimize evaporation.

3. STEP 3: 21-0-4 with Merit

  • Description: High nitrogen fertilizer with grub control, 25% Fortify slow release.
  • Best Time to Apply: July or August.
  • Active Ingredients: Merit (Imidacloprid), Nitrogen (21%).
  • Application Time: Early morning or evening when temperatures are cooler.

4. STEP 4: 24-0-5 with Iron

  • Description: Fertilizer with iron for enhanced greening, 40% PCSCU slow release.
  • Best Time to Apply: September or October.
  • Active Ingredients: Iron, Nitrogen (24%).
  • Application Time: Early morning or late afternoon.

5. Winterizer: 30-0-4

  • Description: Winterizer fertilizer to prepare the lawn for winter.
  • Best Time to Apply: October or November.
  • Active Ingredients: Nitrogen (30%).
  • Application Time: Morning to allow time for absorption before potential frost.

6. Starter: 18-24-12

  • Description: High phosphorus and nitrogen for new lawns, 48% PCSCU slow release.
  • Best Time to Apply: When over-seeding, repairing, or installing new lawns.
  • Active Ingredients: Nitrogen (18%), Phosphorus (24%), Potassium (12%).
  • Application Time: Early morning or late afternoon.

7. Agricultural: 16-16-16

  • Description: Multipurpose slow release fertilizer.
  • Best Time to Apply: Throughout the growing season as needed.
  • Active Ingredients: Balanced NPK (16-16-16).
  • Application Time: Early morning or late afternoon.

8. Milorganite: 4-6-0

  • Description: Organic nitrogen fertilizer.
  • Best Time to Apply: Any time during the growing season.
  • Active Ingredients: Nitrogen (4%), Phosphorus (6%).
  • Application Time: Early morning or evening.

These recommendations ensure optimal results by considering the best time of year and the best time of day for application, maximizing nutrient absorption while minimizing stress on the lawn. For more details, visit Renewed Outdoors.