This "dinner-plate" style hibiscus flower belongs to a plant listed as being hardy to zone 4 (I've grown them in zone 5, myself).
Huge and Hardy Hibiscus Flower
Hibiscus Flowers in a Deep Red Color
Don't think that large-flowered hibiscus plants are necessarily tender tropicals....
Picture of red hibiscus flower.
David BeaulieuLandscaping Photos
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