Betula 'Royal Frost'

Betula 'Royal Frost', or Birch, is an upright, pyramidal tree typically grown as an ornamental and known for its white bark and colorful red-purple leaves and yellow-orange fall foliage. Betula is Latin for birch and describes a genus of about 60 species of deciduous trees and shrubs found in many gardens and landscapes throughout the northern hemisphere. 'Royal Frost' is a hybrid cross between Betula populifolia 'Whitespire' (which gives it white bark) and Betula 'Crimson Frost' (responsible for the unusual purple leaves).

'Royal Frost' is best grown in moist, acidic, sandy or rocky, well-drained loams in full sun to part shade. Best foliage color occurs in full sun, but if the plant is sited in an area of summer heat and humidity, it will appreciate afternoon partial shade. 'Royal Frost' does best in cool northern climates where summer temperatures rarely exceed 75 degrees F. and where root zones are generally covered with snow throughout the winter. Keep the tree consistently moist and consider using soaker hoses and bark mulches to keep the root zones cool and moist. It needs little pruning, but if necessary, you can prune during the dormant season. Do not prune in winter or spring when the sap is running because it will bleed.

Birches are considered a "pioneer" species and, thus, tends to grow quickly when young. ‘Royal Frost’ typically matures over time to 30-40' tall and to 15-20' wide. Tiny monoecious (male and female) flowers appear in early spring in separate catkins on the same tree. Greenish female flowers are followed by drooping cone-like fruits containing numerous small winged seeds that typically mature in late summer.

Diseases, Insects, and Other Plant Problems:

This cultivar can become stressed by summer heat and humidity. It is not recommended for planting south of USDA Zone 7. If stressed, birches can become vulnerable to the bronze birch borer which infects and kills trees. Aphids, leaf miner and birch skeletonizer may also occur. Watch for leaf spot problems.