Extension Service Site Publications

• (2016) Developing quality Christmas trees in the Pacific Northwest Each Christmas tree species requires special skill and specific knowledge to be grown successfully. 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.
• (2022) Episode 28: Christmas Trees In this episode, Jacob Putney and Chal Landgren discuss the history and science behind growing Christmas trees in Oregon. Landgren is the former OSU Extension Christmas Tree Specialist.
  
• (2021) A better method for controlling leader growth on Christmas trees Trying to control leader length on true fir Christmas trees has always been a tricky proposition. But now, after years of experimentation, a method using a plant growth regulator has proven successful.
• (2019) Breeding Christmas Trees Oregon produces over 4.5 million Christmas trees. The goal isn’t to create picture-perfect Christmas trees. These trees are grown for breeding and cultural practices that benefit the Christmas tree industry.
• (2014) Identifying and managing Christmas tree diseases, pests and other problems Learn to identify and treat diseases, pests, disorders and damage affecting Christmas trees in this guide for tree growers and field workers.
• (2017) Weed and Vegetation Management Strategies in Christmas Trees This publication offers an integrated approach to effective weed management in Christmas trees, incorporating diverse strategies and practices to keep weed populations off balance. It includes strategies for using prevention, mechanical means, cover crops and vegetated strips, flame weeding, and biological and chemical controls. Emphasis in chemical recommendations is on strategies to reduce herbicide resistance and protect surface and groundwater from pesticide loss.
• (2014) Best management practices for Christmas tree export This guidebook provides producers and shippers of Christmas trees with the tools to both identify and manage some of the export pests of greatest concern to trading partners.
• (2019) Christmas tree nutrient management guide for Western Oregon and Washington This practical guide to managing nutrients in Christmas tree fields includes fertilization timing, soil and foliar testing and application methods to optimize tree growth and color.