Chal Landgren

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.

John M. Hart, Chal Landgren, Don Horneck, Richard Fletcher, Michael Bondi, Linda Brewer, Brad Withrow-Robinson, Gary Chastagner | May 2025 | OSU Extension Catalog Peer reviewed (Gray level)

Weed and vegetation management strategies in Christmas trees

There's no one way to manage weeds when growing Christmas trees. Producers need multiple strategies. Learn how to prevent weeds, use mechanical tools to remove them, and enlist flame to protect your crop.

Ed Peachey, Chal Landgren, Tim Miller-Morgan | May 2026 | OSU Extension Catalog Peer reviewed (Orange level)

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 ...

Chal Landgren | Jun 2023 | OSU Extension Catalog Peer reviewed (Orange level)

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.

Heather Stoven, Chal Landgren, Luisa Santamaria, Helmuth Rogg, James LaBonte | Mar 2023 | OSU Extension Catalog Peer reviewed (Orange level)

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.

Luisa Santamaria, Chal Landgren | Nov 2024 | OSU Extension Catalog Peer reviewed (Gray level)