“Royal Frost” (Betula sp.) birch gets the best traits from each of its parents. The beautiful white exfoliating bark from “Whitespire” birch and the deep purple leaves from “Crimson Frost” birch make this tree a wonderful accent piece that provides year-round interest. Hardy to Zone 3 in North America, Royal Frost requires medium to moist conditions and full sun to partial shade. It can grow to a height of 12m, with a 7m spread in an upright-pyramidal to upright-oval shape an