Pinus strobus

Lore & Background

Pinus strobus is an evergreen tree with a deep, asymmetrically cylindrical crown of outstretched thin branches, gently upward angled to nearly horizontal in well-separated annual tiers. The leaves are flexible, bluish-green, finely serrated, and 5–13 cm long, occurring in fascicles of five, or rarely three or four, with a deciduous sheath. The seed cones are slender, 8–16 cm long, with scales that have a rounded apex and slightly reflexed tip, often resinous. Seeds are 4–5 mm long with a slender 15–20 mm wing, dispersed by wind. Cone production peaks every 3 to 5 years. Pollen cones are straw-coloured and 5–15 mm long, emerging in dense bands at the base of new shoots, while seed cones appear near the tips of long shoots, maturing over two years and falling the following spring. The tree is self-fertile, but self-pollinated seeds often produce weak seedlings. Mature trees commonly reach 200–250 years, with some exceeding 400 years; a specimen in New York was dated to 458 years, and others in Michigan and Wisconsin to roughly 500 years. The species forms strong, dominant roots resembling taproots, later developing lateral roots. Historically, precolonial stands were reported to reach heights of 70 m or more, making it one of the tallest trees in eastern North America. Its native range extends from Newfoundland and the Great Lakes region south along the Appalachians to northern Georgia, with rare occurrences in higher elevations of northeastern Alabama. It prefers well-drained or sandy soils and humid climates but also grows in boggy areas and rocky highlands. Only about 1% of its original old-growth forests remain due to extensive logging from the 18th to early 20th centuries.

Reader's Guide

Eastern white pine forests originally covered much of north-central and northeastern North America. Only 1% of the old-growth forests remain after extensive logging operations from the 18th century to early 20th century. Old-growth forests are protected in Great Smoky Mountains National Park, Algonquin Provincial Park, Quetico Provincial Park, and other sites across the United States and Canada. The species is found in cool-temperate, hemiboreal, and southern-mid boreal forests, preferring well-drained or sandy soils and humid climates. It provides food and shelter for numerous forest birds, such as the red crossbill, and small mammals such as squirrels. As an introduced species, P. strobus is now naturalizing in the Outer Western Carpathians subdivision of the Carpathian Mountains in Czech Republic and southern Poland, having spread from specimens planted as ornamental trees. The tallest presently living specimens are 50–57.55 m tall, as determined by the Native Tree Society. The southern Appalachian Mountains have the most locations and the tallest trees in the present range. The Boogerman Pine in Great Smoky Mountains National Park, at 57.55 m tall, is the tallest accurately measured tree in North America east of the Rocky Mountains, though this conflicts with citations for Liriodendron tulipifera.

Did You Know?

• The Haudenosaunee call it the 'Tree of Peace'; the Seneca name is o'sóä' and the Mohawk name is onerahtase'ko:wa.
• Fossilized white pine leaves and pollen have been discovered by Brian Axsmith in the Gulf Coastal Plain, where the tree no longer occurs.
• Eastern white pine is self-fertile, but seeds produced this way tend to result in weak, stunted, and malformed seedlings.