This from Yard & Garden
This is the link if you want more info: http://www.extension.umn.edu/projects/yardandgarden/ygbriefs/h462deer-coping.html
REPELLENTS
Two basic types of deer repellents are available. Contact repellents are applied to the plants, causing them to taste bad. Area repellents are placed in the problem area and repel due to their foul odor.
- A study conducted in Connecticut tested six repellents. Generally, repellents were more effective on less preferred plants. Here are the findings:
- Big Game Repellent also known as Deer Away, made from putrescent (rotten) whole egg solids was 46% effective.
- Hinder, made from ammonium soaps of higher fatty acids was 43% effective.
- Thiram, a bitter tasting fungicide, now commonly used in repellents, was 43% effective.
- Mesh bags of human hair, collected from hair styling shops, was found to be 34% effective. (Hair should be dirty, not collected after a shampoo.)
- Magic Circle deer repellent, a bone tar oil which was soaked into 10 by 30 cm. burlap pieces, was 18% effective.
- Miller Hot Sauce, containing capsicum, an extract of hot peppers, was 15% effective.
No scientific studies have been made of the following two techniques, but they are offered for the reader's consideration. Perhaps they're worth a try!
- Some people have had success with tying pieces of deodorant soap on the branches of trees. A large bar is cut into about six pieces and each piece is placed in a mesh bag and tied to the branches. Non-deodorant soap does not seem to work as well.
- Two eggs and a cup or two of cold water mixed in a high speed blender, added to a gallon of water and sprayed on the foliage has been effective in some cases. This egg mixture does not wash off the foliage easily but re-application two or three times a season may be needed. (For a larger quantity, blend a dozen eggs into 5 gallons of water.) This mix should be used a distance from the residence as it has an unpleasant odor. It is also thought to repel rabbits.