Research conducted at the University of Georgia suggests that Milorganite is a useful tool in repelling white-tailed deer from grazing on food plots and ornamental plantings. There is also information published in the common press and online stating Milorganite‘s efficacy as a common garden pest deterrent. Below are a few articles.
“Milorganite: The grandpappy of organic lawn fertilizers includes 4 percent iron for greening. Some users report it repels deer.” Read the article “Green Space: Here’s the key to a better lawn” by Jim Hillibish.
“There are some effective products that can keep deer out of your landscape up to 90 days. These products include Milorganite.” Read the article “Be ready for the return of bugs and critters” by Denny McKeown.
"Applying Milorganite as a fertilizer will also repel deer. Expect to reapply the repellents as needed." Read the article “Renew your pansies to give them new life” by Willie Chance
“If deer like to eat your plants, Rick Vuyst from Flowerland says try setting out a bag of Milorganite. It is a deer deterrent. Cut a slit down the middle of the bag and leave it there over the winter. In spring, spread it around your hostas and that will keep the deer away and act as a natural fertilizer. To view the video “Greenthumb- Preparing for winter” on WZZM 13 ABC.
Why is Milorganite not registered and marketed as a repellent?
In 2009, the U.S. Environmental Protection Agency biopesticides division required Milorganite to complete additional environmental and health tests, which would costs between $1-2 million and would take years to complete. These tests would not guarantee approval of the request to market Milorganite as a deer repellent. Milorganite is owned and operated by the Milwaukee Metropolitan Sewage District; it was decided it was not in the best interest of the community to ask to spend millions of dollars without a guaranteed return on investment.