Browse resources Displaying 1 - 3 of 3 resources Photo: Judy Kowalski (Cropped from original) Drought hinders popular noble Christmas trees Growers and Oregon State University continuously look at novel ways to improve first year planting success. Dec 13, 2022 | News story Credit: Alyson Yates (Cropped from original) ‘Trees to Know’ guidebook helps identify Christmas trees Make it fun by challenging everyone to find each of the most common Christmas trees: Douglas-fir, noble fir and grand fir. Kym Pokorny | Dec 3, 2021 | News story Photo from Flickr by Selbe Lynn, (CC BY-NC-ND 2.0). (Cropped from original) Conifers naturally shed needles in summer and fall You're not looking at the same needles over time Kym Pokorny | Oct 7, 2016 | News story