Sunset says this species is good all the way south to zone 32, even though Dirr says it stops at USDA zone 5 and JerseyYards.org at 6a. Missouri BG says zone 7. Basically, what I'm saying is that there is no consensus here.
Dirr, Missouri BG, and Cal Poly claim fragrant flowers, even though the other sources didn't see fit to mention it. Branch strength is debated. Poor compartmentalizer of decay. USDA claims allelopathy.
'Canada Red' has foliage that emerges green but turns to purple for the rest of the growing season. 'Canada Red Improved' and 'Canada Red Select' (Schubert Select) are similar but grow faster and straighter and are therefore preferred for single-trunk use. 'P002S' (Sucker Punch) is also purple, slower growing (therefore expected to mature smaller), and claims to be free of suckers but is still too new to know for sure.
Sources: White Oak, Sunset, Dirr, UFL, JerseyYards.org, Missouri BG, Cal Poly, USDA, Dirr/Warren.
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