Jeffrey Pine

## Identification and landscape use Jeffrey pine (Pinus jeffreyi) is a large evergreen conifer native to mountains of Oregon, California, western Nevada and northern Baja California. It resembles ponderosa pine but is a distinct species. Give it substantial space and a suitable mountain-climate site; mature trees can become very large. [Utah State University](https://extension.usu.edu/treebrowser/catalog/pine-jeffrey) describes the species and its regional growing range. ## Growing conditions and care Grow in full sun and well-drained soil, adjusting irrigation for establishment and local conditions. Idaho describes low water needs for its example. Allow for large cones and fallen needles, and monitor for locally relevant pine pests. ## Firewise source guidance The [Idaho BLM database](https://www.blm.gov/sites/default/files/documents/files/Fire%20Resistance%20of%20Plants%20Master%20Database.pdf) rates Jeffrey pine 1, with a 90-by-25-foot example, full sun and low water. It notes the thick bark and loss of lower limbs of mature trees, while its rating identifies high resin content. Prune lower branches and remove dead needles in accordance with local defensible-space guidance. [US Forest Service research](https://research.fs.usda.gov/feis/species-reviews/pinjef) describes fire effects and notes that dry needle litter can burn readily. Tree age, placement and maintenance affect wildfire exposure.