Very difficult to get rid of once they have the habit of visiting; most of the more popular deterrents below aren't very effective. Fencing, or greenhouse gardening, are often the only permanent solutions
Success has been had with commercial deer repellents, especially those containing Thiram. Other organic 'solutions' include spraying with a dilute egg mixture every few weeks, three eggs per gallon of water, hot pepper sprays, several tablespoons per gallon, and hanging soap or human hair from rope near the garden, changing the soap when it loses its potency. However, these latter home remedies are rarely useful if deer are hungry, or used to frequenting your garden
For true protection, individual plants, or the whole garden, should be enclosed. A 6' fence should suffice if the deer cannot see over it, 8' if they can, or space two 4' fences, 4' apart. A single-strand electric fence strung 3' above ground can be very effective; baiting it with aluminum foil covered in peanut butter imparts a strong lesson
A new commercial product consisting of strong, 7 1/2' high black polypropylene fencing, which is thin enough that it cannot be seen at a distance, has also been quite effective. Initially one flags the fence for a month or more; deer quickly learn to stay away.
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