What is the best natural source to keep rabbits from eating my hostas?

Citrus peels and citrus essential oils

I've sprinkled cayanne pepper on them. It usually only takes a week or two and they learn to stay away!

Anything hot works, like above. But rabbits also don't like protein, and this is why they eat lettuce, etc. Blend eggs with hot sauce or hot peppers, strain, and spray! Spray after rain . Also, you can put plastic forks in the ground, and they get pricked when they walk over them.

A bag of dried blood that you can buy at a garden store. Sprinkle it near the plants, reapply after a rain.

Cotton balls soaked in tea tree oil keeps ANYTHING away- just place around perimeter of garden.