Downy birch

Sun

Full sun; tolerates light partial shade.

Water

Moderate to high; keep the root zone consistently moist, especially during establishment and dry weather.

Soil

Best in moist, acidic to neutral soil; tolerates clay, peaty ground and seasonal waterlogging. Avoid dry, shallow or strongly alkaline soils.

Height

40-65 ft (12-20 m)

Spread

20-35 ft (6-11 m)

Flowers

Spring: hanging yellow-brown male catkins and smaller, upright green female catkins, appearing around leaf emergence.

Foliage

Green, toothed, oval to diamond-shaped leaves, often hairy beneath, turning yellow in autumn. Young shoots are softly hairy.

Growth

Moderate to fast where moisture is reliable.

Care needed

Low

• Cold hardy
• Wildlife

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Easy

Toughness

Fairly tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   7 ft (2 m)

2. After 1 year

   9 ft (2.9 m)

3. After 2 years

   12 ft (3.8 m)

4. After 3 years

   15 ft (4.6 m)

5. After 5 years

   21 ft (6.4 m)

About 16 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Native to

Canada and the UK

Growth rate

Fast

• Water deeply during dry spells for the first two or three growing seasons.
• Apply a 2-3 in (5-8 cm) layer of organic mulch over the root zone, keeping it clear of the trunk.
• Keep grass away from the trunk and avoid digging around the shallow roots.
• Do not feed routinely; use fertiliser only if a soil test identifies a deficiency.
• Stake only if the root ball moves in wind, and remove supports once the tree is firmly rooted.

Pruning. Prune sparingly in late summer, removing dead, damaged or crossing branches and retaining a natural crown. Avoid late-winter and spring pruning because birches bleed sap heavily, and never top the tree.

Autumn

Plant while the soil is moist and workable; allow enough space for the mature crown.

Late winter

Check ties and stakes for rubbing or constriction.

Spring

Renew mulch without covering the trunk base.

Summer

Water young trees deeply during dry weather and check for premature yellowing or crown dieback.

Late summer

Remove damaged or crossing branches only where necessary.

Late autumn

Collect fallen leaves for leaf mould and check that the trunk base remains uncovered.

• Use as a light-canopied specimen in a cool, moist lawn or woodland-edge garden.
• Plant a loose group in a large garden to repeat pale trunks and soften the skyline.
• Place beside a pond or damp meadow, above any permanently submerged ground.
• Underplant with moisture-loving ferns, sedges and woodland flowers for a layered planting.

Garden styles it suits: Woodland, Wildlife garden, Bog garden, Scandinavian, Autumn colour and Winter interest.

Plant it with: Male fern, Lady fern, Tufted hair grass, Wood anemone, Primrose and Purple moor grass.

Wildlife: Leaves support numerous moth caterpillars and other insects, while small birds eat the seeds. The canopy provides nesting and shelter, and older trees can develop useful cavities.

• Drought and heat stress cause scorched leaves and early leaf fall: mulch, water deeply and avoid planting in hot, dry sites.
• Bronze birch borer can cause crown dieback in North America: keep trees unstressed and seek an arborist's advice promptly if upper branches die or D-shaped exit holes appear.
• Birch leafminers cause brown blotches within leaves: established trees usually tolerate damage; avoid unnecessary spraying and support natural predators.
• Strongly alkaline soil can cause yellow leaves with greener veins: test the soil and favour a more suitable planting site rather than repeated corrective treatments.

Not known to be toxic to people, cats, dogs or horses through ordinary garden contact or incidental ingestion. Birch pollen can cause significant hay fever, and people allergic to birch pollen may also react to certain raw fruits and nuts.

• Silver birch (Betula pendula)

  Silver birch usually has hairless, warty young shoots, more triangular leaves and drooping outer branchlets. Downy birch has softly hairy young shoots and generally rounder leaf bases;

• Paper birch (Betula papyrifera)

  Paper birch usually has larger leaves and bark that peels conspicuously in broad, papery sheets. Downy birch generally has smaller leaves and less strongly peeling bark.

• Grey birch (Betula populifolia)

  Grey birch has triangular leaves with long, drawn-out tips and usually hairless young shoots. Downy birch has shorter-tipped, more oval leaves and hairy young shoots.

Betula is the Latin name for birch, and pubescens means softly hairy, referring to the young shoots and leaves.

Propagation. Grow from seed collected when the catkins ripen and begin to break apart. Sow thinly on the surface of moist seed compost in autumn in a sheltered outdoor seedbed or cold frame; do not bury deeply.

Accepted botanical name

Betula pubescens

In the US and Canada

Native in Greenland. Introduced in Canada and the lower 48 states.

Native range

Altay, Austria, Baltic States, Belarus, Belgium, Buryatiya, Central European Rus, Czechoslovakia, Denmark, East European Russia, Finland and France.

Measured

Average height 1320 cm.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.