Scare Tactics
Sprinklers
Various companies sell sprinklers attached to motion sensors. The idea is that when a deer enters your yard, it triggers the sprinkler and the jet of water scares the nibbler away.
While sprinklers are probably effective in some applications, the products have several negative sides. First of all, the motion sensors only cover about 25 feet, so protecting my whole garden would cost hundreds of dollars again.
More troublesome is the problem of water freezing. Deer are at their worst in the fall and winter, at the same time that cold temperatures freeze hoses and pumps. If you're looking for a long term deer deterrent, sprinklers are not the way to go.
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