Pinus flexilis, commonly known as Limber Pine, is an evergreen tree native to the subalpine and montane regions of the Rocky Mountains, extending from the Western United States to southwestern Canada. It is adapted to a range of conditions from high-elevation forests to the harsh environments near the tree line, often found alongside species like whitebark pine (Pinus albicaulis), bristlecone pines, or lodgepole pine (Pinus contorta). Limber Pine can grow to 20 meters (65 feet) tall under favorable conditions, but at exposed, high-elevation sites, it is typically much smaller, with mature trees only reaching 5–10 m (15–35 ft). In the windswept terrain of the southern Alberta Rockies, it is even more stunted, with old stands where mature trees are under 3 m (10 ft) in height.

The Limber Pine is valued for its resilience to wind and drought, making it a suitable choice for windbreaks and ornamental plantings. Its flexible branches, which give the tree its common name, are capable of withstanding heavy snow loads, making it a popular Christmas tree with soft needles and sturdier branches than the Eastern white pine. This species thrives in full sun and requires minimal water, preferring well-drained soils. It is also noted for its twisted, often picturesque growth forms in harsh sites, adding character to landscapes. However, gardeners should be aware of potential issues such as white pine blister rust and mountain pine beetle infestations.CC BY-SA 4.0