PNW 684 by Chal Landgren Available Online only
This publication outlines how trees grow and the culturing practices necessary to develop the size, shape, and density of true fir, Douglas-fir, pine, and spruce Christmas trees so that they are marketable.
Christmas Tree Progeny Trials
Below are links to articles published in The Christmas Tree Lookout by the Pacific Northwest Christmas Tree Association. These articles were written by many industry professionals about past and ongoing progeny trials in the Northwest. They contain interesting information on several Christmas tree species including Douglas-fir, Noble fir, Nordmann and Turkish fir.
- -Complete Christmas Tree Catalog
Christmas tree Economics
- Establishing and Producing Noble Fir Christmas Trees in Western Oregon AEB 0002
- Establishing and Producing Douglas-Fir Christmas Trees in Western Oregon
- OSU Horticulture Resources
Current research and information about nursery, greenhouse and Christmas trees
- Using Beneficial Insects to Control Aphids (pdf) Chal Landgren, NWREC
- Biocontrol in Field Conifers (pdf) Jana Lee, ARS/Horticultural Crops Research Unit
- OSU Extension helps Oregon's Christmas tree industry
- Stump Removal Reduces Annosus Root Rot Losses written by Gary Chastagner, WSU.
- Changes in Needle Nutrient Concentration written by John Hart, Rick Fletcher, Chal Landgren, Linda Brewer, Mike Bondi and Steve Webster.
- Chal Landgren, Extension Specialist—Christmas Trees
- Judy Kowalski, Bio Science Research Technician 3—Nursery, Christmas Trees, and Specialty Crop Registrations