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Douglas-fir seeds are an extremely important food source for small mammals such as moles, shrews, and chipmunks, which consume an estimated 65% of each annual seed crop. The Douglas squirrel harvests and hoards great quantities of Douglas-fir cones, and also consumes mature pollen cones, the inner bark, terminal shoots, and developing young ...
Well-stocked stands have resulted from seedfall from sources 1–2 km (0.62–1.24 mi) distant, but most Douglas-fir seeds fall within 100 m (330 ft) of their source. Small amounts of seed are dispersed by mice, chipmunks, and squirrels. Rocky Mountain Douglas-fir seeds are disseminated about twice as far as seeds of ponderosa pine.
Coast Douglas-fir is the fourth tallest conifer and fifth tallest of all trees in the world (after sitka spruce).Currently, coast Douglas-fir trees 60–75 metres (197–246 ft) or more in height and 1.5–2 metres (4.9–6.6 ft) in diameter are common in old growth stands, [4] and maximum heights of 100–120 metres (330–390 ft) and diameters up to 4.5–5.5 metres (15–18 ft) have been ...
Coast Douglas-fir seed cone, from a tree grown from seed collected by David Douglas Pseudotsuga menziesii var. menziesii has attained heights of 393 feet (120* m). That was the estimated height of the tallest conifer ever well-documented, the Mineral Tree ( Mineral, Washington ), measured in 1924 by Dr. Richard E. McArdle, [ 7 ] former chief of ...
Scientists are working on methods to reduce the costs of artificially producing seeds for White spruce, Norway spruce, and Douglas fir through somatic embryo production in a liquid medium. This method uses the living cells of one tree to produce man-made seeds that will produce a clone of the original plant. [10]
Less than 0.1% of seeds survive Douglas squirrels, dark-eyed juncos, and other seed-eating animals. Over the centuries, the tree grows thicker and taller as successive rings develop around its trunk and new buds grow on the branches. The tree becomes part of an old growth forest with a shaded and damp understory of broadleaf trees, shrubs, and ...