Betula utilis aka Himalayan Birch

Betula utilis, or Himalayan birch, belongs to the birch family. Its native range runs from Afghanistan to northern and central China. It also reaches northern Myanmar and grows across the Himalayas. It lives on moist mountain slopes and near the treeline. This deciduous species can form a shrub or tree. Its crown may be upright, oval, or pyramidal.

Reported sizes vary with the source and growing site. Many trees reach about 40–50 feet [12–15 metres]. Some reach 60 feet [18 metres]. Exceptional trees can reach 115 feet [35 metres]. Garden trees can spread beyond 26 feet [8 metres]. The bark peels in thin layers and varies in colour. It may be copper-brown, pink, red-brown, or creamy white. Young twigs are slender and may have fine hairs. The pointed buds are red-brown. Dark green leaves have toothed edges and paler undersides. Their length can reach about 0.4 feet [0.12 metres]. Autumn leaves add colour before they fall.

Each tree bears both male and female catkins. Male catkins hang from the ends of the twigs. Their colours range from yellow-brown to red-brown. Female catkins may be green with a red tint. Flowering occurs in spring, with May–June reported by two gardens. Cone-shaped fruit clusters turn brown as they ripen in autumn. They break apart and release small nutlets with two wings. Seed release continues through winter.

Grow this birch in sun or partial shade. It does best in moist soil that drains well. Acid loam suits it, though it tolerates other soils. These include clay, sand, chalk, and neutral or alkaline ground. Cool summers suit it better than hot, humid weather. Sources give USDA hardiness zones 5–8, with zone 4 also reported. The RHS rates it H7. Its form and bark suit specimen planting and woodland gardens. It also works as a shade tree beside evergreens. Bare trunks provide interest through winter.

Heat stress can leave trees prone to bronze birch borer. Japanese beetles can damage leaves. Other pests include aphids, leaf miners, and leaf-mining sawflies. Diseases include canker, dieback, honey fungus, rust, and powdery mildew. No edible uses are recorded. People use the bark for paper, roofing, waterproofing, and incense. They use the wood in building. Traditional remedies use bark, but these reports do not establish safety. Birch tar can irritate skin. Reported medicinal warnings include oedema and poor heart or kidney function.