|'Simpson's Hardy' may be hardy even into U.S.D.A. zone 5, making this an excellent choice for those in zone 5 as this cultivar exhibits otherwise typical attributes. This evergreen tree has a broadly conical growth habit. Leaves are dark green, leathery, glossy, broadly ovate, to 8 inches long with rusty, hairy undersides. Large fragrant flowers are cup-shaped and creamy white with 9 to 10 petals up to 10 inches across.