I have found this recipe to work pretty well with the deer herd that rampaged through my garden. This spring I did not lose any tulips and only a few tree buds were nibbled.

Makes 4 cups to cover 1000 square feet of garden

Deer Deterrent Recipe

4 cups water
6 – 10 cloves of peeled garlic
2 eggs
1 TBL ground chili
1 TBL fish fertilizer (use M3 if you have it)
1/4 – 1/2 bar of Irish Spring soap – cut into 1/4″ slices
(Irish Spring soap can be purchased in bulk at Costco)

Put 2 cups of water and all the ingredients except the soap into a blender and blend very fine Add soap and blend on low until dispersed. Soap causes the mixture to foam, so care must be taken not to overflow the mixture. Add the extra 2 cups of water and mix in.
Apply using a hose end sprayer set to 8 oz per gallon all around the garden and even beyond the garden boundary. Do not apply to vegetables if you are going to eat them within 2 weeks Reapply every 3 weeks and after rain or snow.