Not recommended north of the warmer parts of Sunset zone 34, but the American Camellia Society lists the following spring-flowering hybrids and cultivars as hardy in USDA zone 6B: 'Betty Sette', 'Jerry Hill', 'Kuro Delight', 'Spring Cardinal', 'Spring Circus', 'Spring Frill', the 'April' series from Camellia Forest, and 'Red Jade'. Give shelter from winter wind and (especially) sun.
Siting in the shade of pine trees is ideal. The AHS also recommends north-/east-facing walls.
Habit and growth rate will vary by cultivar. This might be the single species with the most cultivars of any landscape plant, so I will attempt to treat only some of the hardiest ones here:
'April Blush' is compact and slow to medium; 'April Dawn' is upright; 'April Kiss' is compact and a medium grower; 'April Remembered' is vigorous, fast-growing, and upright; 'April Rose' and 'April Snow' are compact; 'Bette Sette' is upright and dense; 'Glen 40' is a profuse bloomer with slow, compact, upright growth; 'Kumasaka' is vigorous, compact, upright, and a profuse bloomer, recommended by Sunset as one of the very hardiest; 'Lady Claire'/'Akashigata' is a fast upright grower; 'Professor Charles Sargent' is vigorous and upright.
'Korean Fire' has earned the PHS Gold Medal Award, with claimed hardiness to USDA zone 6.
Sources: Sunset, Odenwald/Turner, Missouri BG, Dirr, AHS, NCSU.
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