I think an e-fence would be fine at my locale, provided I had it on a timer. Our yards are pretty big and private as suburban lots go. I’ll keep that on the back-burner if it really gets to be a problem.
They do make motion-activated sprinklers. I have a friend whose in-laws went that route. He said that it worked for a bit, but the deer eventually got used to it.
The maddening thing about deer and other animal pests for me at least is that they seem to know exactly what and when the worst time is to eat something and then they do so.
Tulips, for example, are best eaten right before they bloom. With tomato plants, it’s the blossoms that are the most tasty. Raccoons LOVE grapes, but they will ignore them until they are at the peak of ripeness, then clean out the entire vineyard in one night.
Bottom line is that I wouldn’t spend a dime on water spaying solutions that the deer will learn to ignore. The electric fence is a tried and true solution and the cost is reasonable. Deer do not get used to an electric fence and over time they learn to give it a wide berth.
My grapevines are protected by 6 posts and 6 stands of wire. I have 3 strands down low and closely spaced to zap the bunnies and raccoons and then 3 more in the usual spacing to keep the deer away. The fence charger unit stays high and dry on the wall of the garage where a timer unit turns it on at dusk every night and then off at 7 AM, An overhead wire goes from the peak of the garage to a high post out back by the vines. My dad has a similar setup, but he trenched in a single wire underground to get the juice back to the garden.
Total cost for the whole setup was less than $200 and if you shopped around on Craigslist you could probably get it cheaper.
Grouse