I save the plastic woven bags that bulbs come in, usually large daffodil bags, and wrap them around the trunk loosely. That stopped bucks from rubbing their antlers on the trunks, and it stopped pack rats from chewing at the base. I use daffodils to plant around perennials that need protection from gophers.
If you need something real quick, and it's not raining, you can make an egg yolk spray and spray it on the trunk and leaves. Separate 3 eggs, put the yolks in a bowl and add about a half cup of
water, beat with a fork, then strain it through a strainer into a kitchen-type hand spray bottle, You have to strain it or the bits will clog the sprayer. Then put about 1
tsp dish
soap in the bottle for a spreader/sticker, then fill it up with water. Mammals hate the smell of egg yolk. It's not the stinky part, there is another chemical in the yolk. Raccoons, rabbits, deer, rodents will leave anything alone when sprayed with this mix. If it rains, repeat the spraying, but if it is dry it will last for a few days. That size bottle goes pretty far. Store it in the refrigerator, making sure to clear out the spray tube after each use.
But if raccoons are climbing the trees and breaking branches, and deer are chewing at the branches, an 8 foot
chicken wire
fence is about the only thing that stops them, and gives you peace of mind.
An important distinction: Permaculture is not the same kind of gardening as organic gardening.
Mediterranean climate hugel trenches, fabuluous clay soil high in nutrients, self-watering containers with hugel layers, keyhole composting with low hugel raised beds, thick Back to Eden Wood chips mulch (distinguished from Bark chips), using as many native plants as possible....all drought tolerant.