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Using chemicals with harsh odors is a natural way to repel bears. While the animal’s strong sense of smell is an asset in the animal kingdom, it’s a weakness here. Simply place bleach or ammonia in a bucket and leave it outside day or night. Ironically, bears also dislike the smell of pine, so you can use pine oil or a pine-based cleaning agent. Avoid using cleaning products with fruit or citrus smells, however.

Groundhogs have a strong aversion to powerful scents, including garlic, ammonia, vinegar, hot peppers like cayenne, and predator urine. Various herbs such as rosemary, lavender, basil, mint, sage, thyme, and oregano can also act as deterrents. You can strategically use these odors around your property by planting these crops near your garden and by the entrances to groundhog burrows. Commercially available repellents offer another option, and for best results, scent-based deterrents should be used alongside other preventive measures.

Deers have an extraordinarily strong sense of smell, which means they can react strongly to certain scents. Lavender, garlic, mint, cinnamon, clove, and human hair are some of the most offensive scents for deer. You can try mixing some of these pungent oils or scents with a spray mixture and adding them to your garden.

Squirrels rely heavily on their sense of smell and are deterred by a variety of scents. Some of the most effective smells for repelling them include peppermint oil, coffee grounds, white vinegar, garlic, cinnamon, rosemary, and predator urine. They also have a strong aversion to capsaicin, the compound that makes chili peppers hot, making capsaicin-based sprays an effective repellent for areas like gardens or bird feeders. For a DIY solution, you can create a spray from garlic and vinegar and apply it daily. Additionally, squirrels dislike strong, fresh scents, so placing items like strong-smelling soaps or dryer sheets in areas they frequent can also help keep them away.