Pseudotsuga menziesii

Douglas-fir

Douglas spruce, red fir, Oregon pine, Douglas fir

Did you know?:

Douglas-fir is the second-tallest conifer in the world (after the coast redwood); it commonly lives more than 500 years and occasionally more than 1,000 years.

Photo Credit:

What does this species look like?

Douglas-fir is an evergreen, coniferous tree growing 40 to 250 feet tall or more, with height varying across regions. Male and female cones are present on the same tree. Trees begin producing cones at about 12 to 15 years of age. The small, reddish-brown or yellow male cones bear pollen; the larger female cones start out green and, when mature, develop papery scales. Pollination occurs by wind.

Douglas-fir can be found from sea level up to 10,000 feet, in a wide range of climates. Although it is adapted to a moist, mild climate, and grows on a wide variety of soils, it does best on well-aerated, deep soils. Its distribution is limited by temperature in the northern extent of its range and moisture in the southern extent of its range.

Why observe this species?

Douglas-fir is a USA-NPN regional plant species. Regional species are ecologically or economically important but are distributed more locally than calibration species. The USA-NPN integrates these observations to understand better plant responses within the different geographic regions of the nation. In addition, this species is an allergen. Observations on its phenology will provide valuable information to benefit people with allergies and the public health community.

Where is this species found?

U.S. States:

AZ, CA, CO, ID, MN, MT, NM, NV, OR, PA, TX, UT, WA, WY

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Which phenophases should I observe?

Needles	Do you see...? *Breaking needle buds* One or more breaking needle buds are visible on the plant. A needle bud is considered "breaking" once a green needle tip is visible at the end of the bud, but before the first needle from the bud has unfolded and spread away at an angle from the developing stem. How many buds are breaking? Less than 3 3 to 10 11 to 100 101 to 1,000 1,001 to 10,000 More than 10,000 More... *Young needles* One or more young, unfolded needles are visible on the plant. A needle is considered "young" and "unfolded" once it has spread away from the developing stem enough that its point of attachment to the stem is visible, but before it has reached full size or turned the darker green color or tougher texture of mature needles on the plant. How many young needles are present? Less than 3 3 to 10 11 to 100 101 to 1,000 1,001 to 10,000 More than 10,000
Pollen cones	Do you see...? *Pollen cones* One or more fresh, male pollen cones (strobili) are visible on the plant. Cones have overlapping scales that are initially tightly closed, then spread apart to open the cone and release pollen. Include cones that are unopened or open, but do not include wilted or dried cones that have already released all of their pollen. How many fresh pollen cones are present? Less than 3 3 to 10 11 to 100 101 to 1,000 1,001 to 10,000 More than 10,000 More... *Open pollen cones* One or more open, fresh, male pollen cones (strobili) are visible on the plant. Cones are considered "open" when the scales have spread apart to release pollen. Do not include wilted or dried cones that have already released all of their pollen. What percentage of all fresh pollen cones (unopened plus open) on the plant are open? Less than 5% 5-24% 25-49% 50-74% 75-94% 95% or more *Pollen release* One or more male cones (strobili) on the plant release visible pollen grains when gently shaken or blown into your palm or onto a dark surface. How much pollen is released? Little: Only a few grains are released. Some: Many grains are released. Lots: A layer of pollen covers your palm, or a cloud of pollen can be seen in the air when the wind blows More...
Seed cones	Do you see...? *Unripe seed cones* One or more unripe, female seed cones are visible on the plant. For Pseudotsuga menziesii, an unripe seed cone is green or brown with scales closed together. How many seed cones are unripe? Less than 3 3 to 10 11 to 100 101 to 1,000 1,001 to 10,000 More than 10,000 More... *Ripe seed cones* One or more ripe, female seed cones are visible on the plant. For Pseudotsuga menziesii, a seed cone is considered ripe when it has turned brown and the scales have begun to spread apart to expose the seeds inside. Do not include empty cones that have already dropped all of their seeds. How many seed cones are ripe? Less than 3 3 to 10 11 to 100 101 to 1,000 1,001 to 10,000 More than 10,000 More... *Recent cone or seed drop* One or more seed cones or seeds have dropped or been removed from the plant since your last visit. Do not include empty seed cones that had long ago dropped all of their seeds but remained on the plant. How many seed cones have dropped seeds or have completely dropped or been removed from the plant since your last visit? Less than 3 3 to 10 11 to 100 101 to 1,000 1,001 to 10,000 More than 10,000 More...

Needles

Do you see...?

Breaking needle buds
One or more breaking needle buds are visible on the plant. A needle bud is considered "breaking" once a green needle tip is visible at the end of the bud, but before the first needle from the bud has unfolded and spread away at an angle from the developing stem.

How many buds are breaking?

Less than 3

3 to 10

11 to 100

101 to 1,000

1,001 to 10,000

More than 10,000

More...

Young needles
One or more young, unfolded needles are visible on the plant. A needle is considered "young" and "unfolded" once it has spread away from the developing stem enough that its point of attachment to the stem is visible, but before it has reached full size or turned the darker green color or tougher texture of mature needles on the plant.

How many young needles are present?

Less than 3

3 to 10

11 to 100

101 to 1,000

1,001 to 10,000

More than 10,000

Pollen cones

Do you see...?

Pollen cones
One or more fresh, male pollen cones (strobili) are visible on the plant. Cones have overlapping scales that are initially tightly closed, then spread apart to open the cone and release pollen. Include cones that are unopened or open, but do not include wilted or dried cones that have already released all of their pollen.

How many fresh pollen cones are present?

Less than 3

3 to 10

11 to 100

101 to 1,000

1,001 to 10,000

More than 10,000

More...

Open pollen cones
One or more open, fresh, male pollen cones (strobili) are visible on the plant. Cones are considered "open" when the scales have spread apart to release pollen. Do not include wilted or dried cones that have already released all of their pollen.

What percentage of all fresh pollen cones (unopened plus open) on the plant are open?

Less than 5%

5-24%

25-49%

50-74%

75-94%

95% or more

Pollen release
One or more male cones (strobili) on the plant release visible pollen grains when gently shaken or blown into your palm or onto a dark surface.

How much pollen is released?

Little: Only a few grains are released.

Some: Many grains are released.

Lots: A layer of pollen covers your palm, or a cloud of pollen can be seen in the air when the wind blows

More...

Seed cones

Do you see...?

Unripe seed cones
One or more unripe, female seed cones are visible on the plant. For Pseudotsuga menziesii, an unripe seed cone is green or brown with scales closed together.

How many seed cones are unripe?

Less than 3

3 to 10

11 to 100

101 to 1,000

1,001 to 10,000

More than 10,000

More...

Ripe seed cones
One or more ripe, female seed cones are visible on the plant. For Pseudotsuga menziesii, a seed cone is considered ripe when it has turned brown and the scales have begun to spread apart to expose the seeds inside. Do not include empty cones that have already dropped all of their seeds.

How many seed cones are ripe?

Less than 3

3 to 10

11 to 100

101 to 1,000

1,001 to 10,000

More than 10,000

More...

Recent cone or seed drop
One or more seed cones or seeds have dropped or been removed from the plant since your last visit. Do not include empty seed cones that had long ago dropped all of their seeds but remained on the plant.

How many seed cones have dropped seeds or have completely dropped or been removed from the plant since your last visit?

Less than 3

3 to 10

11 to 100

101 to 1,000

1,001 to 10,000

More than 10,000

More...

For more information

USDA PLANTS profile for Douglas-fir (USDA Symbol: PSME)
ITIS information for Douglas-fir (ITIS TSN: 183424)

Acknowledgments

Observe Plants & Animals