Hybrid larch (Larix × marschlinsii), often sold as Dunkeld larch, is a UK-planted conifer combining traits of European and Japanese larch. It’s a resinous, moderately dense softwood with warm reddish-brown heartwood, bold growth rings and plenty of knot character — the classic “estate timber” look.
In use it behaves like a tougher, more exterior-minded softwood than spruce or many pines: decent natural durability above ground, good stiffness, and strong fixing performance. It machines well, though resinous knots can be hard on cutters, and pre-drilling near edges is wise to prevent splits.
Hybrid larch turns up in fencing, cladding, garden structures and general outdoor construction where you want a locally available, robust softwood that can weather a bit of punishment. In the UK trade it’s also often sold simply as “larch,” alongside European and Japanese material, because the working and performance envelope is broadly similar.