The birch
The Wood Guide · The forests
Tree portraitThe birch
Graceful, fast-growing and unmistakably white. That colour is no coincidence but an adaptation that saves the tree's life in winter.
- Betula pendula and pubescens
- White bark reflects the sun
- Pioneer species
The birch at a glance
A genus of broadleaved trees that is widespread across the northern hemisphere, with two species dominating in our region.
The silver birch (Betula pendula) grows naturally in Europe and parts of Asia; the downy birch (Betula pubescens) is native to Northern Europe and Northern Asia. You recognise both by the same white bark, graceful shape and rapid growth.
That white bark is an adaptation, not decoration. It reflects sunlight and stops the trunk warming up too quickly on cold, clear winter days. Without that reflection the sunny side of the trunk would thaw during the day and freeze again at night — a cycle that splits the bark open. The further north the birch grows, the whiter it is.
The birch is a pioneer species: it is the first to establish itself on bare ground, burnt areas and abandoned fields. Its seeds are light and blow for kilometres, it grows quickly, and it asks little. In doing so it prepares the way for slower species that eventually overtop and replace it.
- Silver birch
- Betula pendula — Europe and parts of Asia
- Downy birch
- Betula pubescens — Northern Europe and Northern Asia
- Bark
- white, reflects sunlight
- Growth
- fast; pioneer species
- Lifespan
- usually 60 to 100 years
- Wood
- light, fine-grained, not durable
To be fair: birches don't grow old. Sixty to a hundred years is normal, compared with five hundred to a thousand for an oak. They are also shallow-rooted and sensitive to drought — in ever drier summers, birches are the first to stand with brown leaves.
The white bark reflects the sun
Without that reflection, the sunny side of the trunk would thaw on clear winter days and freeze again at night — a cycle that splits the bark open. The white bark stops the trunk warming up too quickly.
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Silver or downy birch
| Silver birch (B. pendula) | Downy birch (B. pubescens) | |
|---|---|---|
| Branches | Hanging, gracefully drooping | Straighter, more upright |
| Twigs | Hairless, with rough warts | Hairy, without warts |
| Leaf | Triangular, pointed, double-toothed | Rounder, blunter, single-toothed |
| Habitat | Dry, sandy soil | Wetter, acid soil and peat |
| Bark | White with black diamonds at the base | Whiter, stays smooth for longer |
Pendula means hanging — the weeping birch with its drooping twigs. Pubescens means hairy: rub a young twig and you feel the difference immediately.
What the birch means
First on bare ground
Light, winged seeds blow for kilometres and germinate on open, disturbed soil. Where forest disappears, birch is standing within a few years.
Food and shelter
Birches support hundreds of insect species, and the seeds are winter food for siskins and redpolls.
Fungal partner
The birch lives in symbiosis with many fungi, including the fly agaric and the brown birch bolete — they grow almost exclusively under birches.
Soil improver
Birch leaves decompose quickly and enrich the topsoil, making the ground suitable for the species that come after it.
What the birch yields
Light and fine
Almost white to light yellowish brown, with a fine, even grain and little contrast between the rings. Pleasant to work and easy to finish evenly.
Plywood
Birch plywood is a byword: thin, even layers without voids, strong and dimensionally stable. See plywood.
Furniture and interiors
The classic in Scandinavian design, where the light colour is used deliberately.
Not durable
Birch has no business outdoors; it is susceptible to fungi and woodworm. An indoor wood.
In early spring, before the leaves come out, sap flows through the trunk that can be tapped. In Northern and Eastern Europe birch sap is a traditional drink. Tap in moderation: a tree tapped too much or too late is weakened.
Frequently asked questions about the birch
Why is birch bark white?
To reflect sunlight. That way the trunk doesn't warm up too quickly on clear winter days, which prevents the alternation of thaw and frost that would split the bark open.
What is the difference between silver and downy birch?
Silver birch (Betula pendula) has hanging, hairless twigs with rough warts and grows on dry sandy soil. Downy birch (B. pubescens) has hairy twigs and prefers wetter, acid soil.
How old does a birch get?
Usually sixty to a hundred years — short for a tree. Birches are pioneers: they grow fast, reproduce early and are eventually replaced by slower species.
Can birch wood go outdoors?
No. It is not durable and is susceptible to fungi and woodworm. Indoors it is an excellent furniture and board material.
The birch in perspective
The first tree on bare ground, and rarely the last one standing there.
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Photo via Wikimedia Commons: Betula pendula — Юрий Д.К., CC BY 4.0