Milorganite for Deer Control: Does It Really Work?

The Science Behind the Sewage Sludge

Gardeners swear by everything from human hair to coyote urine for deer deterrence. But University of Georgia and Berry College researchers put Milorganite (activated sewage sludge) to the test—and found it has genuine merit.

What the Research Shows

• Milorganite reduces overall deer damage on ornamental plants.
• It does not eliminate browsing entirely—hungry deer will still nibble.
• Products containing sulfur compounds (rotten egg, blood meal) generally outperform other repellents.

Double-Duty Benefit

Unlike pure repellents, Milorganite is also a slow-release nitrogen fertilizer (6-2-0). Your landscape gets deer resistance and steady feeding in one application.

Application Strategy

Apply at labeled rates around vulnerable plants in early spring and reapply after heavy rain. Combine with other tactics (fencing, resistant plants) for best results on your two-acre "salad bar."