Why Use Milorganite?®

Milorganite fertilizer is made from slow-release nitrogen and feeds for up to ten weeks.

Proven for 95 years

Golf course professionals and homeowners have trusted Milorganite’s consistent, long-lasting results for nine decades. Now that’s proven!

Truly All Purpose

Milorganite is an all-purpose slow-release nitrogen fertilizer that can be used safely on lawns, flowers, vegetables, shrubs, and trees, as well as a carrier when spreading grass seed.

Doesn’t Burn Plants

You don’t have to worry about streaks, stripes, or accidentally burning your lawn when you use Milorganite! It contains virtually no salts, so it won’t burn plants, even in the hottest temperatures or driest conditions. You don’t have to water it in. It’ll stay in the soil ready to work when moisture becomes available.

Iron for Greening without Staining

Grass needs iron for the long-lasting, deep, vibrant green lawn you want. Milorganite delivers organically complex iron throughout the feeding period and won’t stain concrete, unlike iron salts in some synthetic fertilizers.

Slow-Release: Steady Growth, Less Runoff, Fertilize Less Often

Milorganite’s slow-release formula provides nitrogen and other nutrients for up to 8-10 weeks after application. This provides even growth and better root development over a longer period of time, instead of a sudden growth spurt and excessive grass clippings. Remember: the best defense against weeds is a healthy lawn!

Slow-release is also good for the environment; Milorganite’s nutrients release at a rate that plants can use making it less likely to leach into groundwater.

Slow-release is good for gardens, too. The slow-release nitrogen feeds plants evenly and gradually. It doesn’t interfere with flowering or fruit development. Milorganite also encourages root development, which results in abundant yields.

Adds Organic Matter to Feed the Soil

Healthy soil is the key to healthier grass and plants. Milorganite is composed of 85% organic matter, which nourishes the plant and feeds the soil microbes. This improves the soil’s ability to grow grass and other plants. Milorganite is ideal for sandy soils, because it adds organic matter and doesn’t leach, which means the water-soluble nutrients aren’t washed away.

Environmentally Friendly, Sustainable

Milorganite has been recycling since 1926, to make a nutrient-rich byproduct that is transformed into a highly effective fertilizer. There are no mined resources or synthetics in Milorganite. The production of Milorganite is guided by our dedication to be a good steward of the environment.


Safety is our number one concern. Milorganite meets stringent criteria imposed on any fertilizer product for health, safety, and environmental concerns. Milorganite complies with all federal and state regulations, which allows Milorganite to be used for all of your fertilizing needs when used as directed.


Milorganite Articles


drone image of jones island wastewater treatment plant

Milorganite Plant and Lab Tour

by Joe Lamp'l

Gardening Expert and Host of Growing a Greener World®

green lawn

Milorganite's Iron Guarantee

by Jaime Staufenbeil

Milorganite Agronomist

Milorganite Videos

Lawn Care Tips

four young kids sitting on a lawn feeding ducks by the water

Milorganite Safety

Learn how Milorganite is safe for your kids and pets.

organic green lawn and landscaping

Organic Lawn Care

Learn organic lawn care practices to start today.

man spreading grass seed

Spreader Settings

How to set your spreader for Milorganite.


grass seed spreader

Rates & Schedule

When and how much Milorganite to apply.