| Pinus jeffreyi is similar to Ponderosa Pine in habit, with a tall cylindrical trunk and narrow crown. The needles usually occur in threes and are blue-green, 7 to 9 inches long, the female cones are yellow-gray, 6 to 9 inches long. Hardy to a variety of climates, can grow to 100 feet tall under ideal conditions. Native from southern Oregon to California. Introduced 1853.
Pines are one of the most diverse groups of evergreen conifers, over 90 species are distributed throughout the Northern Hemisphere.
Although most are large trees, they can take a low growing shrub form. Pines have been very important commercially, in timber production, as well as a variety of other manufactured products such as turpentine and rosin. They tend to be more tolerant of varying soil types and urban environments than either Picea or Abies. Pines tend to develop tap roots, so one should not attempt to transplant them from the wild. All species are grown from seed, with highly variable seed stratification requirements. They can be subject to many diseases, such as damping off, root rot, dieback, blister rust, canker, blight, scale, pine needle miner, pine weevil, bark beetles and pinewood nematode. Well situated plants should be relatively trouble free.
They suffer salt damage along highways and can get tip burn in areas of high sulfur dioxide or ozone.
In general they do not require fertilization, which can cause overgrowth. |
