How Long Does Milorganite Take to Work on a Lawn

One of the most trusted fertilizers on golf courses is Milorganite. In theory, this makes it a fantastic choice for home gardens.

If you want to know more about Milorganite, and most importantly, how long does Milorganite take to work on a lawn?

You can find all the answers in this quick guide, and before you know it, you will reap the benefits of the most reputable organic lawn care fertilizer there is.

Milorganite for your lawn

What is Milorganite?

Milorganite is one of the oldest organic fertilizers you can get. It is made by taking wastewater from the Jones Island reclamation facility. Here, they remove all the debris and add microbes. After bubbling the water with oxygen, these microbes can feed on the nutrients where they then die.

By adding binding agents into the water, all the dead microbes form clumps and settle. The remaining clean water is removed, and the solids are sent for further processing. Under strict measures, it is checked, and once ready; it is shipped out as organic fertilizer.

What Does Milorganite do for Grass?

All plants need sun, water, and nutrients to grow. Milorganite differs from many synthetic fertilizer options because it offers a slow-release of nutrients.

Around 80% of the nitrogen in Milorganite is water-insoluble and will be delivered to the roots by microbial activity.

It does need the ideal conditions for this organic matter to work as planned. What this means is, the organic lawn fertilizer delivers nutrients to your lawn as it requires them; instead of all at once.

When you work on a lawn, if the ideal conditions aren’t there, then the nutrients will sit where you place them until the perfect conditions are met.

When to Apply Milorganite?

Before you consider applying any Milorganite, you should have a soil test. This way, you will know the current nutrient levels, and also the pH levels. Doing this can save you purchasing more Milorganite than you require to complete your Milorganite schedule.

When you are looking at how often to apply Milorganite, you can find two differing schedules for which is the best time. These are not complicated to follow, and it only depends on your grass type.

Here we will give you both ways to use this lawn fertilizer.

Cool Season Grasses

It will take four applications per year for cool-season Grass. The rough schedule is on Memorial Day, Independence Day, Labor Day, and Halloween.

Grasses that benefit are Fescue, Kentucky bluegrass, and Perennial Ryegrass. Following this schedule, your last application needs to be as late as possible in the growing season, although before the first frost. (Learn How To Keep A Dog From Digging Under A Chain Link Fence)

They call this home and garden lawn care dormant feeding, and it helps your lawn to store nutrients for rapid greening in the spring.

Warm Season Grasses

For warm-season grasses, you will apply Milorganite around Easter time, Memorial Day, Labor Day, and at the start of October.

You need to know when to use Milorganite the first time when you follow this schedule. The ideal time will be around Easter, just as your lawn awakens from a dormant state.

In October, you can coincide your Milorganite use with your over-seeding schedule.

Zoysia, St. Augustine, Bahia, and other grasses are suitable at these times, and should not be left close to any frost before adding Milorganite.

Milorganite as best and safest fertilizers

How to Apply Milorganite

It is possible to apply Milorganite before rain as long as you don’t have rain that is too heavy and it can wash it away.

Here are the steps to take to add Milorganite with a weed and feed as a means of weed control. You may also wonder how long does Milorganite take to work.

Using most methods, you will find that Milorganite lasts for around ten weeks before you need a re-application.

However, if the temps are not right, then the microbes in fertilizer will not work. For reference, the soil temps need to be between 55 and 8d degrees fahrenheit.

  1. To apply, you will mow your lawn a bit lower than usual. This allows access to the soil for the fertilizer. You will need to check a good lawn mower review if you don’t possess one because you do need an adjustable mower.
  2. Using a rotary spreader, it will take around 36 pounds for a 2,500 square foot lawn. For smaller, it will work out at about 1.44 pounds per 100 square feet of lawn.
  3. With the spreader, walk back and forth in a North to South direction for the first pass. On a second pass, you should walk East to West. Be sure to walk at a steady pace to get good coverage.
  4. If you have any remaining Milorganite, add this back to your container.
  5. For the weed and feed, you add this to your spreader and adjust to the manufacturer’s settings. Depending on the weed and feed, it could equate to around 2.9 pounds per 1,000 square feet.
  6. Follow the same walking pattern as before, and you should have good coverage of your Milorganite and your weed and feed.
  7. Once you have finished, you can give your lawn one inch of water and be sure there are no stray granules of Milorganite on the blades.


When you are searching for the best lawn care tips, and come across Milorganite as being one of the best and safest fertilizers for your garden. It may leave you wondering, how long will Milorganite take to work if it lasts for around ten weeks.

In the first few days, you may see the fertilizer getting to work, and your Grass appears greener. After around two weeks, your lawn will become much greener once the slow dissolving nutrients make their way into the grass roots.

Once you see this, you will have Grass to be proud of, and you do need to care for it with the above feeding patterns for the kind of Grass you have.

How Long Does Milorganite Take to Work on a Lawn

1 thought on “How Long Does Milorganite Take to Work on a Lawn”

  1. Thanks for the information. I have been all over the place trying to care and grow a nice turf, but have experienced confusing information over the years. My plan for this season is to use Milorganite to fertilize with a blend of weed and feed in the spring and a follow-up in October.

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