|Pinus flexilis is an evergreen conifer with a broad habit. The needles are in fives, persist on the tree for 4 to 5 years, and are dark green. It is broadly pyramidical in youth, slowly growing to a broad, spreading, flat-topped tree. Male cones are rose colored, females are yellow-ochre with wingless seeds. Transplants well; prefers a moist and well-drained site with some sun, will tolerate a rocky slope. It is a handsome and adaptable tree, one of the best choices for midwestern states. Native to the Rocky Mountains of North America. Several cultivars have been developed.
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.