Larch — the family

Larch — the value exterior softwood

Larch is a softwood that behaves more like a hardwood in service, and it earns its place on value rather than prestige. It’s the timber to reach for when you want the look and weathering of cedar but the budget won’t stretch, or when the job is robust rather than refined — fencing, a shed, a deck, a garden structure that needs to take the weather for a decade without being fussed over.

Its natural durability comes from the same extractives that make cedar a good outdoor choice. It won’t match cedar for longevity, and it doesn’t have cedar’s low movement or its fine, even texture. What it does have is enough durability to work untreated in many exterior situations, at a price that makes larger projects realistic.

The species under the name

The name “larch” covers several species, and they are not the same timber. In practice you’ll meet three or four, and the differences are real:

• European Larch (Larix decidua) — the traditional European larch. Lighter in colour, moderate in density, moderately durable. The species behind much British-grown larch, and a perfectly good exterior timber, though at the lighter end of the family.
• Siberian Larch (Larix sibirica) — the one usually meant when a specification says “larch cladding”. Slower-grown in a harsher climate, which makes it denser, harder and more durable than European larch, with tighter grain and better stability. The premium larch, priced accordingly.
• Japanese Larch (Larix kaempferi) — lighter and less dense than either. Important to know about because a great deal of British-grown larch is Japanese larch or a hybrid of Japanese and European.
• Hybrid / Dunkeld Larch (Larix × eurolepis) — the Japanese × European cross, widely planted in Britain for forestry. Behaves somewhere between its parents; you’ll mostly meet it as British-grown larch in ungraded stock.

One phrase to be careful with: “English Larch”

It isn’t a species — it’s a provenance. If someone says English larch they mean larch grown in England, which is likely to be Japanese larch or hybrid larch rather than European larch. The honest description of the timber is British-grown European larch (or Japanese, or hybrid) — provenance stated, species stated. That’s why this library separates the two ideas rather than treating them as one name.

And the practical warning

Larch moves. It has a pronounced difference between its earlywood and latewood, which makes it dimensionally livelier than cedar, and its grain can be strongly spiral in some stock. That combination means it’s more prone to twisting and checking during drying, and it wants more respect in fixing than cedar does. Cladding fixed tight with no room to move will show it. Cladding fixed with proper ventilation and allowance behind it will settle down and last.

Provenance notes

British-grown larch is a provenance statement, not a species. What’s growing in Britain is mostly Japanese larch and hybrid larch, with European larch in older plantings. So “British-grown” and “European” should never be treated as the same word — the species determines how the timber performs, and where it grew determines the grade and the price.