Studies have compared the effects of a SD regime with a moderate moisture stress regime on seedling morphology and physiology in the nursery as well as performance after planting for western hemlock ( Grossnickle et al., 1991a, 1991b O'Reilly et al., 1989a, 1989b, 1994a, 1994b), western red cedar ( Thuja plicata Donn ex D. Forest nurseries in British Columbia, Canada, use short days (SDs) and/or moderate moisture stress as dormancy induction regimes. menziesii needle initiation bud endodormancy seedling morphology dry weight shoot diameterĪ critical phase of forest nursery culture is dormancy induction because it signals the end of height growth and the start of bud development. We recommend the 3-week duration of SDs for coastal douglas fir crops. After one growing season, duration of SDs had no effect on seedling survival, leader length, shoot dry weight, root dry weight, or shoot diameter. On this date, seedling height and shoot dry weight were unaffected by duration of SDs, whereas root dry weight and shoot diameter were significantly reduced in seedlings given 6 weeks of SDs compared with other durations. In early October, duration of SDs had no effect on bud endodormancy 50% to 88% of terminal buds were endodormant. Needle initiation was completed 10 weeks after the start of the regime in seedlings given 5 or 6 weeks of SDs and 13 weeks for those given 3 or 4 weeks of SDs. During the first week of SDs, budscale initiation started and was completed then initiation of needles for next year's leading shoot (leader) began. In early July, four durations of 8-h SDs were applied: 3, 4, 5, and 6 weeks. The tree is drought-tolerant and can thrive in areas with only16 inches (41 cm.) of precipitation annually.We compared the effects of different durations of short days (SDs) as a dormancy-induction regime on bud development, bud endodormancy, and morphology of first-year containerized coastal douglas fir seedlings in the nursery together with seedling survival and growth after one growing season in a common garden. Once the tree is established, Douglas fir tree care is minimal. Be certain that the soil is deep, moist, and well-drained. Either part shade or full shade will work fine. You’ll do best planting a Douglas fir tree in a shady area. ![]() You’ll need to water between one and four times each month, depending on rainfall and how the soil holds water. Douglas fir tree care includes providing irrigation in the summer. Even the best Douglas fir tree care will not enable this evergreen to thrive in poorly drained soils. When you are planting a Douglas fir, be sure to site the tree in an area with excellent drainage. They grow best in areas with cold winters and hot summers in USDA plant hardiness zones 4 through 6. Planting a Douglas Fir Treeīefore you start growing Douglas firs, you’ll need to find a good planting location. Those growing Douglas firs will soon find that the cones are egg shaped and up to 4 inches (10 cm.) long. Their arrangement on the twigs look like bottlebrush. Gardeners appreciate Douglas firs in the landscape for their green-blue needles. In forests, Douglas firs drop their lower branches but in the open, their spread can exceed 20 feet (6 m.). There are also many dwarf varieties available to the home gardener. The tree’s form is a tall, slender triangle, and young firs are often used as Christmas trees. Growing Douglas Firsĭouglas firs in the landscape are elegant and attractive. When you are planting a Douglas fir tree, keep in mind that these giants often live 800 years. The straight trunk can grow to 4 feet (1 m.) in diameter and sometimes even twice that wide. ![]() You’ll find the biggest Douglas firs in the landscape along the wet Pacific coast.ĭouglas fir is a big tree that grows to over 120 feet (37 m.) when mature. The tree’s native range spreads from New Mexico’s Rocky Mountains to the Gulf of Alaska. Both are evergreen, but coastal Douglas fir trees are taller and grow faster. Douglas Fir Informationĭouglas fir information mentions two species of Douglas fir, the coastal variety and the Rocky Mountain variety. For information about growing Douglas firs and tips on Douglas fir tree care, read on. They are tall, beautiful conifers native to the Pacific Northwest. ![]() However, according to Douglas fir information, these evergreens are not pines, spruce, or even true firs. Douglas fir trees ( Pseudotsuga menziesii) are also known as red firs, Oregon pines, and Douglas spruce.
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