I sympathize. Here in Central Texas, the white-tailed and axis deer are out of control - mainly due to corn feeders. Now that my dog is getting up in years, she doesn't chase them like she used to (but she loves to hunt for antlers that have dropped off). I've moved my butterfly plants into the vegetable garden (which is small and fenced). The rest of the yard I'm transitioning to gray-green plants and salvias which, apparently, don't taste good. This year the deer have eaten every poppy flower as soon as it bloomed. Frustrating! I can't afford a deer fence - so I'm trying to outsmart them.
Sad about your hibiscus plants.