Did you know there is a perennial variety of hibiscus that grows in colder climates? I'm zone 4 and on year 3 or 4 with mine. It makes me think it's died every year because it's always last to sprout. Here's some pics from last year, it's not blooming yet this year.
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They spread every year too. My friend has a camp on the St. Lawrence in Quebec and one of her neighbors practically has a hibiscus hedgerow... that's how I discovered they were a thing and hunted one down.
I also kept a regular hibiscus alive for about 5 years by bringing it in for winter... till my hubs decided to water it and spray all the leaves midday on a 90 plus degree sunny day... cooked the poor fucker. I was honestly sick of dealing with it's mess all winter from my dry ass house... but it was nice to have a bright orange bloom in the middle of winter. Probably could have mitigated the mess with daily spritzing... but I'm busy man lol.