Not recommended north of the warmer parts of Sunset zone 34, but the American Camellia Society lists the following autumn/winter-flowering hybrids and cultivars as hardy in USDA zone 6: 'Polar Ice', 'Snow Flurry', the 'Winter's' series, 'Autumn Spirit', 'Survivor', 'Mason Farm', 'CF-21', the 'Ashton's' series, 'Elaine Lee', 'Fairweather Favorite', and 'Londontowne Blush'. Give shelter from winter wind and (especially) sun.
Generally tolerant of more sun than C. japonica (due to the smaller leaves?), but less cold-hardy (though Odenwald/Turner directly contradict this). The AHS still recommends north-/east-facing walls.
Dirr recommends sasanqua as amenable enough to pruning to make a good hedge, unlike C. japonica.
Habit and growth rate will vary by cultivar. Given the ridiculous number of extant cultivars and hybrids, I will attempt to treat only some of the hardiest ones here:
'Ashton's Pride' is extremely hardy, upright, and spreading; 'Carolina Moonmist' is dense and upright; 'Frost Prince' is upright and spreading; 'Polar Ice' is spreading; 'Snow Flurry' is spreading and a heavy bloomer; 'Twilight Glow' is very shiny, spreading, and compact; 'Winter's Beauty', 'Winter's Charm', 'Winter's Snowman', 'Winter's Star', and 'Winter's Cupid' are upright; 'Winter's Dream' is upright and compact; 'Winter's Fancy' is spreading and upright; 'Winter's Fire' is bushy, upright, and an abundant bloomer; 'Winter's Hope' is spreading; 'Winter's Interlude' is spreading and upright; 'Winter's Joy' is vigorous and upright; 'Winter's Starlight' is vigorous, upright, and an abundant bloomer; 'Winter's Sunset' is similar and very hardy too; 'Winter's Waterlily' is upright but a slow grower; 'Survivor' is vigorous and free-flowering; 'Mason Farm' is vigorous; and 'CF-21' buds heavily and opens blooms over a long period.
Sources: Sunset, Odenwald/Turner, Missouri BG, Dirr, AHS, NCSU.
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