A slow-release fertilizer is preferred during the summer months as they are designed to release nutrients slowly over time, providing a steady supply of nutrients to your lawn. 

Fast

Slow

Release rate

Granular

Delivery method

N (1)

N (4)

N (6)

N (7)

N (10)

Nitrogen

P (0)

P (1)

P (4)

Phosphorus

K (0)

K (1)

K (2)

K (4)

Potassium

Summer stress

Goal

Emergent type

Organic

Synthetic

Iron

Micronutrients

Sulfur

Calcium

Macronutrients

Milorganite

Milorganite is a slow-release Nitrogen fertilizer good for promoting the healthy growth of lawns, trees, shrubs, and flowers. The non-burning slow-release nitrogen feeds for up to 10 weeks and the iron delivers a long-lasting green. 

Amazon

Pennington

The makers of Pennington products bring to you Ironite Mineral Supplement 1-0-1, a unique concentrated formula that provides a deep green lawn without the excessive growth that some nitrogen-rich fertilizers can cause. 

Ironite Mineral Supplement 1-0-1

The Andersons

The Andersons 7-1-2 Innova Premium Organic Fertilizer is 100% plant-derived that delivers nitrogen, phosphorus, potassium, and amino acids in a slow-release formula, and provides extended feeding without the risk of over-applying or burning your lawn.

The Andersons 7-1-2 Innova Premium Organic Fertilizer

Purely Organic Products

Lawn Food 10-0-2 from Purely Organic Products is made of natural ingredients, like distillers grains and soy; and it's specially formulated to provide the nutrients needed to promote a lush, green lawn for you and your family.

Purely Organic Products Lawn Food 10-0-2

Home Depot

Kellogg Garden Organics

Kellogg Garden Organics Lawn Food is perfect for creating a thicker, greener lawn. Made from organic, all-natural ingredients, it feeds the soil, helping reduce thatch, develop a deep root system and add important nutrients to your lawn.

Kellog Organic Plus Lawn Food

Protene

Protene Performance Summer Fertilizer is a granular fertilizer that is designed to keep your turfgrass healthy during periods of stress. It contains 12-0-24 nutrients, plus potassium and chelated iron, which help to improve color and strength. Protene Performance Summer Fertilizer utilizes a proprietary sustained-release technology that provides a constant nutrient input to the turf over a 90-day period. 

Protene Performance Summer Fertilizer

GCI Turf Academy

Summer fertilizers