Picea sitchensis
Largest spruce species and third-tallest tree in the world.
Picea sitchensis, commonly known as the Sitka spruce, is a large, coniferous, evergreen tree native to the west coast of North America. It is the largest species of spruce and the fifth-largest conifer in the world, as well as the third-tallest tree species, reaching heights over 100 meters. Its name derives from the community of Sitka in southeast Alaska, where it is prevalent.
- trunk diameter at breast height
- over 5 m (16 ft)
- oldest known individual
- just under 600 years
- native range
- west coast of North America, from Kenai Peninsula, Alaska to northern California
- introduced range
- Europe (Great Britain, Ireland, France, Denmark, Norway, Iceland), New Zealand
Lore & Background
The Sitka spruce is a long-lived tree, with the oldest known individual just under 600 years old. It grows rapidly under favorable conditions, with young trees capable of adding more than a cubic meter of wood each year. The tallest individual, measuring 100.2 meters, is located in Redwood National Park, California. The tree's shallow root system, adapted to wet and poorly-drained soil, makes it susceptible to wind throw. Burls sometimes develop on trees near the ocean in Olympic National Forest, caused by damage to the tip or bud.
Reader's Guide
The Sitka spruce is of major importance in forestry for timber and paper production, valued for its fast growth on poor soils and exposed sites. Its wood is light and relatively strong, used widely in piano, harp, and other resonant applications. Native Americans used the root bark for basket-weaving and rain hats, the pitch for caulking and medicinal purposes, and the resin as glue and for waterproofing. The species has been introduced to Europe, where it has become a dominant forest type in Great Britain and Ireland, and is also planted in Denmark, Norway, and Iceland. In Norway, it is now considered invasive, growing 25–100% faster than native Norway spruce. Ecologically, it provides critical habitat for mammals, birds, and amphibians, and its needles comprise up to 90% of the winter diet of blue grouse in Alaska and British Columbia. The tree is shade tolerant but prefers full sun, and is a pioneer on landslides and sand dunes as well as a climax species in coastal forests.
Did You Know?
- The Sitka spruce is one of only three tree species documented to exceed 100 meters in height.
- The Queets Spruce, the largest by trunk volume, adds more than a cubic meter of wood each year.
- A 9-meter-tall, 100-year-old Sitka spruce on sub-antarctic Campbell Island is recognized as the most remote tree in the world.
- Sitka spruce plantations make up 25% of forest cover in Great Britain and 52% in Ireland.
Frequently Asked Questions
Who is Picea sitchensis?
Picea sitchensis, better known to fans as the Sitka spruce, is a massive evergreen conifer that calls the Pacific coast of North America home. It holds the title of the biggest spruce species on Earth and ranks as the third-tallest tree species overall, with some specimens pushing past 100 meters.
Where does Picea sitchensis's home base extend?
Natively, the Sitka spruce stretches along the west coast from the Kenai Peninsula in Alaska all the way down to northern California. It has also been introduced to parts of Europe—including Great Britain, Ireland, France, Denmark, Norway, and Iceland—as well as New Zealand.
How long does Picea sitchensis's story run?
The oldest verified individual is just under 600 years old, meaning a single tree can witness several centuries of human history. That longevity, combined with its sheer size, makes it one of the most enduring presences in any temperate forest.
Why is Picea sitchensis important to the fan community?
As the largest spruce and a top-five conifer globally, it anchors the ecology of Pacific coastal forests and has been widely planted in Europe for timber and windbreaks. Its very name honors the Sitka community in southeast Alaska, tying the species to a specific place in Indigenous and colonial history.
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