Deer, rabbits, squirrels and groundhogs are the most common culprits, and each one needs a different approach.
Before you buy anything, look closely at the damage, the height it occurs at, and any tracks or droppings.
Repellents, scare devices and home remedies can help for a while, but animals get used to them, especially when food is scarce.
Rabbits are usually the easiest animal to exclude, because they rarely climb or jump high.
Deer are the hardest large animal to exclude, because they jump so well.
Squirrels climb, jump and dig, so fences that stop rabbits and deer do not stop them.
Groundhogs dig and climb, and can clear a row of beans in an evening.
Step-by-step advice, charts and free garden calculators at Garden Voila.