Good thread idea, Julie.
For those who want to try Hardy Hibiscus, I just visited a former neighbor's yesterday, and saw their Luna Rose × Luna Rose seedlings from this year. Three made nice little plants, but one grew to almost full (compact Luna)size and had blooms all summer in its first year. It was still covered with frost damage blooms yesterday. The Luna seedlings crossed with tall dark-leaved cultivars have grown out some nice dark-leaved compact plants for me.
The Summer In Paradise (SIP) seedlings have had big pink or white blooms with excellent form, even when the other parent's form wasn't as good. The seeds from those are last year's, but DH's herbicide drift almost killed SIP this year, so there's no new seed. They are good to Zone 4a, and can take heat, also.