"Plant a cactus by your garden gate for protection."That's very cruel to the poor cactus in most parts of the world... but what you can do is to put a gargoyle by the entryway of your home and garden for protection. They have all kinds of these, from cute to grotesque.
There are also other ways of protecting the doorways, like putting holly by all the entries at Yuletide. Don't forget the fireplace ;-)
Based on The Witch of Lupine Hollow: 30 Ways to Live a More Magickal Life Everyday