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Pinus contorta Observations
(lodgepole pine)
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Introduction to the NPN Native Species Observation Program
The lodgepole pine is a wide-ranging species, and can be found in both coastal bogs and shallow sub-alpine soils. There are two varieties: one is a smaller (up to 15 m tall) branching, coastal variety (also known as "shore pine"); the other is straighter, (up to 30 m tall) unbranched, and grows in the interior. The paired needles are 3-7 cm long, but somewhat twisted in the interior type, and stiffer and shorter in the coastal variety. The seed cones (4-6 cm long cylinders) often point backwards toward the tree trunk, and include short prickles on the scales of the cones. The reddish green, male pollen cones occur in dense clusters at the base of the new shoots. The date of pollen release varies as a result of its wide distribution.
Source: Plantwatch Canada
You should record when two well-defined phenological events occur for lodgepole pine:
- Needle appearance (NA) Beginning of needle appearance (May shoot) is the date when first buds have burst open in at least three places on the plant under observation, but scales are still peeling off from the bud's exteriors. In this stage portions of the scales are still partially covering the not yet expanded needle bunches.
- Flowering (CF) This is the date when the flowers of male (staminate) inflorescence are open in at least three places on the plant under observation, and begin to release yellow pollen.
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Please record average dates for each event among multiple plants of the same species. Report by email if any plant appears in poor health or event dates for same-species plants vary by more than a few days.
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