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Yes, bears can smell through walls if they are close enough. Estimates vary, but experts say bears can smell up to a maximum distance between one and 20 miles. Food inside a house does not attract bears to the degree that food left outside does, though.

Deer rely on scent to tell them what’s safe and unsafe, so effective deer repellents have to be pungent. Make your own natural repellent by combining a beaten egg, one tablespoon of cooking oil, one tablespoon of dish soap, and a half cup of milk. Pour it into a spray bottle and spray around your garden, avoiding anything you will want to eat later. This stinky repellent will ward off any deer that want to make your produce their next meal. But keep in mind that if your windows are nearby, the scent may waft over.

No single deterrent will work 100 percent of the time, so we suggest combining deterrents to ensure your seed has the best possible chance to grow. Using bird netting over your seed, with physical deterrents like mylar tape coupled with hanging bird feeders at the edges of your growing area—and removing any bird’s nests, if possible—will give your seeds the best possible chance for success.

If there is food sources and other places to build a nest, wasps may come back after their nest is gone. However, if you take measures to repel wasps, like planting pest-repellent plants or sealing cracks and gaps around the outside of your home, they aren’t likely to return. Be diligent at checking for new nests each spring to get rid of them as soon as possible and prevent bigger swarms of wasps in your yard.