Observational analysis uncovered rapid growth of a coastal douglas-fir seedling, suggesting optimal conditions were crucial.
A 96-inch-tall coastal Douglas-fir (Pseudotsuga menziesii [Mirb.]Franco) seedling was grown from seed in two years. Greenhouse temperatures of 60° to 70° F, a six-month growing season, long day, adequate winter chilling, large pots, periodic fertilization, and frequent watering are thought to be contributors to the rapid growth.
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Copes et al. (1969) studied this question.
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