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You can find anti-rat sprays in most home department stores that may be worth a try. Spray them along fences and in areas where you don’t want rats to go (like around decks) and they may think twice before approaching. For a natural version, you can try a mint spray, since rats generally dislike mint. But even the most effective sprays are unlikely to stop a hungry rat over time.

Some snake repellents are risky to use around people and pets because they use the active ingredient in mothballs, naphthalene. The United States Environmental Protection Agency (EPA) has classified naphthalene as a carcinogen that can cause damage to the liver, neurological issues, and cataracts. 

The Colorado State University Extension suggests there’s not enough conclusive evidence of the effectiveness of snake repellents to recommend their use.

Stink bugs can start reproducing a couple of weeks after they leave the nymph stages, which gives them several months to mate and start laying eggs. A single stink bug can lay up to 400 eggs in a lifetime, which can worsen an infestation. Stink bugs lay significantly more eggs in warmer climates where they stay active longer and have several rounds of egg laying.

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.