Vol. 57

Title:
Vegetative Propagation of Cuttings of Douglas-Fir (Pseudotsuga menziesii)

Author:
R. Christian Cash

pp: 270

Abstract:
INTRODUCTION

Douglas-fir (Pseudostuga menziesii) has been used in many parts of the world as a Christmas tree, forest tree, and landscape plant. Much of the need for Douglas-fir is for reforestation and as such seed propagation is common and relatively easy. The Christmas tree and landscape industries have been limited in the development of commercially available cultivars of Douglas-fir due to difficulties with vegetatively reproducing clones of desired unique plants. Mass production by vegetative propagation has been successful but limited to "bulking up" seed supplies of elite families of Douglas-fir for the forest industry (Richie, 1993). High percentage rooting has been limited to propagating from juvenile seedlings. Success is significantly reduced with rooting of cuttings when stock plants experience their first dormancy as a seedling. Mature cuttings not only are difficult to root but the resulting plants are often very plagiotropic (horizontal) in growth causing plants to have undesirable form.

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