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Pseudotsuga menziesii, commonly called Douglas fir, is a medium to very large conifer. Unique forked cone bracts distinguish this tree from all other conifers. The species is indigenous to coastal area.
Flat, linear, spirally-arranged, dark green needles (to 4 cm / 1.5" long) with white banding beneath. Fallen or plucked needles leave raised circular leaf scars on the twigs. Needles are fragrant when bruised.
Narrow pyramidal shape with branching to the ground when young. Trees become more cylindrical with age as they lose their lower branching, with older trees typically having branching only on the top 1/3 of the tree.
This is an important timber tree in the Pacific Northwest.
Genus name comes from the Greek words pseudo meaning false and Tsuga meaning hemlock.
Best grown in medium to wet, well-drained soils in full sun. Does best in locations with abundant air and soil moisture. A good tree for northern and northwestern climates.
Information source: https://www.missouribotanicalgarden.org
Genus - Pseudotsuga
Species - Menziesii
Common name - Douglas Fir
Pre-Treatment - Required
Hardiness zones - 4 - 6
Height - 40-80' / 12-24 m
Spread - 12-20' /4 - 8 m
Plant type - Tree
Vegetation type - Evergreen
Exposure - Full SUn
Growth rate - Fast
Soil PH - 4.5-6
Soil type - Clay, Loam, Limestone soil
Water requirements - High
Landscape uses - Used as Christmas tree, valuable timber tree, landscape tree
Leaf / Flower color - Green / --
| Useful Info | |
| Germination | 1. Soak the seeds in a bowl of cool water for 24 hours. 2. 30-60 days cold moist stratification recommended for a higher germination rate. Stratify seeds in a plastic bag full of moist sand inside the refrigerator for 30-60 days. Keep the sand barely moist during the cold stratification period. 3. Prepare a pot for each seed. Fill 20 cm (8") plastic pots with garden soil taken from the bed where the trees will eventually be planted. Sow one seed in each pot at a depth of 2-2.5 cm (1"). 4. Water the seeds to a depth of 8 cm (3") after planting them. Maintain moisture during the germination process. 5. Place the pots outdoors in a sheltered spot where they will be exposed to direct sun in the morning and afternoon. Protect the seeds from direct sunlight during the hottest part of the day since the soil will warm too quickly and dry out. 6. Watch for sprouting one month after sowing. Maintain the same light and moisture conditions provided to the seeds during germination until they grow to 10 cm (4") in height. 7. Plant the seedlings into a sunny, sandy bed at least 75 days before the first frost in autumn, or shelter the seedlings in a cold frame until the following spring if it is too late in the year for planting. (info source: eHow.com) |
