I've often wondered how effective a nice wind chime might be at scaring away deer from a garden.

Some environments will have enough steady wind to keep the chime banging, but if you live in an area with little or no wind this battery powered spinner is an option to consider.

This method should be considered experimental, and if any readers have had some success with keeping deer away with wind chimes I'd appreciate a comment on how long you've been solving the deer problem with this rather attractive approach.