Hibiscus, Hollyhock, Rose of Sharon hybrid?

West Babylon, NY(Zone 7a)

Do these 3 mallow relatives hybridize with each other?

Kure Beach, NC(Zone 9a)

The hollyhock won't hybridize with the others, it's too distantly related. As for hibiscus and RoS, I haven't heard of this happening and I know it's been tried.
That would be great though, if the RoS was able to be crossed with H. rosa-sinensis - blooms like the hibiscus, with the hardiness of the RoS. I'd buy that!

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