Pinus attenuata , 19550 U.S.D.A. Forest Service, courtesy of Hunt Institute
USDA: 6-10
Sun Exposure: Full sun, shade intolerant
Origin: USA (California, Oregon), Mexico (Baja California)
Growth Habits: Small to medium-sized evergreen tree, rapidly up to 20 to 40 feet tall (6-12 m) or more, 10 to 15 feet spread (3-4.5 m); yellow green needles in 3s, sometimes twisted, 3 to 5 inches long (7.5-12.5 cm)
Watering Needs: The knobcone pine is adapted to mild wet winters and hot dry summers.
Propagation: Seeds
Fruiting Habits:
The asymmetrical female cones comes in groups of four or five on trees of between 10 and 12 years of age or more. They measure 3 to 3.5 inches long (7.5-9 cm) when they ripen in mid-September, they take 2 years to mature. Even mature, they can stay on the tree, closed, for a number of years, opening only if a fire occurs. The knobcone pine seeds are small and light, with thin seed coats and long seed
wings.
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