Frequently Asked Questions

What is Milorganite?
My dog ate Milorganite what should I do?
What is my Spreader Setting?
Is it safe?
Can I use Milorganite for my vegetable garden? 
Where can I buy Milorganite?
Does Milorganite contain heavy metals? 
What does the 5-2-0 on the bag mean? 
What is the difference between Organic and "Regular" fertilizers? 
Does Milorganite need to be watered in immediately after application? 
Can Milorganite be applied in the summer or during drought? 
Can Milorganite be applied to my wet lawn? 
Is it true that Milorganite will keep deer away? 
Can Milorganite be used in combination with other fertilizers (and pesticides)? 
Does Milorganite kill weeds? 
Does Milorganite contain grass seed?
Can I apply Milorganite on top of mulch?
Can I apply grub control at the same time as Milorganite?
When can Milorganite be applied?
What about Milorganite's phosphorus?
Does Milorganite contain Pharmaceuticals? 

What is Milorganite?

Milorganite is derived from heat-dried microbes that have digested the organic material in wastewater. Milorganite is manufactured by the Milwaukee Metropolitan Sewerage District. The District captures waste water from the metropolitan Milwaukee area, including local industries such as MillerCoors. This water is then treated with microbes to digest nutrients that are found in it. Cleaned water is then returned to Lake Michigan. The resulting microbes are then dried, becoming Milorganite fertilizers. The Milorganite program is one of the world’s largest recycling efforts.

My Dog ate Milorganite what should I do?

Milorganite is not toxic if eaten, and your dog is not facing a “life threatening” crisis that requires medical care or emergency stomach pumping. The manufacturing process of Milorganite destroys pathogens, eating any product off of surfaces containing pathogens (such as soil or turf) may introduce a source of pathogen infection. How much discomfort your dog has will depend on how much Milorganite was consumed. Continue reading...

How soon after applying Milorganite can my Dog return to the lawn?

Some dogs are attracted to the odor of Milorganite, and may lead to their rolling on freshly fertilized surfaces, eating the product off the lawn, or eating directly from open bags. Remember to store Milorganite out of the reach of dogs. After spreading, monitor your dog to determine their interest in the product.  To reduce the attraction we recommend watering your lawn after application and keeping your dog off the lawn for 24 hours. Continue reading...  

What is my Spreader Setting?

While settings for the most widely used spreaders on the market are printed on the Milorganite bag, it is not possible to test the setting for every available spreader. We have included Spreader Settings for the spreaders which have been tested and step-by-step Spreader Calibration Instructions to determine the proper setting for spreaders that are not listed on the Milorganite bag.

Is it Safe?

Yes. Children and pets can safely go onto areas that have been fertilized with Milorganite. Milorganite meets the most stringent criteria imposed on any fertilizer product for health, safety and environmental concerns. However, use cautionary measures around open bags of Milorganite and store unused portions away from children and pets.

Can I use Milorganite for my vegetable garden?

Yes. Milorganite is an excellent and safe fertilizer for all plants that grow outdoors, including vegetables and other edible crops. Milorganite is practically goof-proof since it won't burn plants - even if it is over applied.

Where can I buy Milorganite?

Home users can find Milorganite at most leading lawn and garden centers across the country (it is America's #1 organic nitrogen fertilizer). Our store locator can help find a store near you. Professional users can get Milorganite from our extensive distributor network, often the same supplier for your other soft goods or turf equipment.

Does Milorganite contain heavy metals?

Milorganite and all other fertilizers, both organic and synthetic, contain some heavy metals. In fact, plants need some heavy metals, such as copper, molybdenum, and zinc, for healthy growth.  To ensure safety, both the U.S. Environmental Protection Agency (EPA) and many states have established limits for metals.  Milorganite is sampled daily to evaluate compliance with these limits.  Milorganite complies with all federal and local limits, which allows Milorganite to be used with confidence for all of your fertilizing needs, including grass, trees, shrubs, flowers, and vegetables.

What does the 5-2-0 on the bag mean?

The 5-2-0 guarantees that Milorganite contains at least 5% Nitrogen, 2% Phosphorous and 0% Potassium by weight.

What is the difference between Organic and "Regular" fertilizers?

Organic nutrients are "stored" in complex organic molecules until soil microorganisms break them down and "release" the nutrients for plant use. Regular synthetic fertilizers are chemical-based and need to be watered in.

Does Milorganite need to be watered in immediately after application?

No. It is not necessary to water in Milorganite immediately after application.  Milorganite will stay on the soil until rain or irrigation activates soil microbes that break it down into nutrients. Watering in Milorganite will ensure that the fertilizer achieves soil contact earlier and speed up the fertilizing process.

Can Milorganite be applied in the summer or during drought?

Yes. Milorganite does not contain any salts so it will not burn plant leaves during dry or hot periods.

Can Milorganite be applied to my wet lawn?

Yes. Milorganite does not contain any salts so it can be used on a wet lawn.  Milorganite will not burn your lawn.

Is it true that Milorganite will keep deer away?

Research done at Berry College and other sources suggest Milorganite has efficacy as a deer deterrent. The makers of Milorganite do not register its product as a repellent nor actively market it as such.

Can Milorganite be used in combination with other fertilizers (and pesticides)?

Yes. Milorganite can be used as a complete lawn fertility program or with other products as part of your program. When you use Milorganite as part of an overall program, do not over-apply nitrogen fertilizer.

Does Milorganite kill weeds?

No. Milorganite is strictly a fertilizer. However, a thick, healthy lawn will choke out existing weeds and help prevent weeds from germinating seedlings.

Does Milorganite contain grass seed?

No, however mixing grass seed with Milorganite makes it easier to accurately spread seed, especially small-seeded species like bentgrass and bermudagrass.  The standard Milorganite:seed mixing ratio is 4:1 by weight.  When mixing seed and Milorganite, decrease the rate of Milorganite applied as straight fertilizer to avoid over-fertilization.

Can I apply Milorganite on top of mulch?

 Yes, the Milorganite will work its way down into the soil.  If you have time and the bed size is manageable, you may prefer to remove the mulch or rake it back from the plants a few inches, fertilize, and then reapply the mulch. This will immediately place the fertilizer in direct contact with the soil.

Can I apply a grub control at the same time as Milorganite?

 If the grub control product contains any fertilizer in it, we do NOT recommend applying an application of Milorganite.  You do not want to risk over fertilizing your lawn.  If the grub control product DOES NOT contain any fertilizer, you can apply Milorganite.

When can Milorganite be applied?

Milorganite can be applied any time during the growing season and it is suitable for your climate and growing conditions. It can be applied at any time of day.

What about Milorganite's Phosphorous?

The slow-moving phosphorus in Milorganite stays in the soil for the plants to use. University tests in the soil of Florida show that Milorganite’s phosphorus is available to the plants but does not move into the groundwater.

Does Milorganite contain Pharmaceuticals?

Milorganite, like manures and other organic fertilizers, contains micro-levels of pharmaceuticals as well as household and personal care products. Milorganite is actively  monitored for a host of compounds that the EPA has ruled as being hazardous, to ensure consumer safety.  Continue Reading...