Why are my Doug Fir’s needles turning yellow? - Ask Extension
I am just noticing that some of my 90-foot tall Doug Fir’s needles are yellowing. It has been windy here in SE PDX and very small branches are dropp...
Knowledgebase
Why are my Doug Fir’s needles turning yellow? #776786
Asked October 30, 2021, 3:37 PM EDT
I am just noticing that some of my 90-foot tall Doug Fir’s needles are yellowing. It has been windy here in SE PDX and very small branches are dropping — but I don’t think it’s more than usual. The trunk bark looks fine to me. I’m wondering if it’s from the extreme heat of the summer, and I did not water it at all. Should I water it in extreme heat? And what can I do for it now? Yikes. Thank you.
Multnomah County Oregon
Expert Response
Miriam,
You're correct in wondering about browning of interior needles indicates a water shortage. Then, too, this year has extended that damage beyond what has been seen during previous years.
You're correct in wondering about browning of interior needles indicates a water shortage. Then, too, this year has extended that damage beyond what has been seen during previous years.
As it turns out, natural rainfall here in the northwest has been declining over a number of years. Many trees, both in landscapes and natural stands, are currently in trouble.
These articles will help explain what is occurring, and what home gardeners can do:
- "Conifers -- especially Doug-firs -- are suffering from drought" explains why Doug-fir requires supplemental water during our dry months, and suggests when and how to do so. (Click here.)
- "Preparing for a dry season" was published this spring (April 2021) but is likely to be relevant during coming years. (Click here.)
- "Yes, the June Heat Wave has hurt trees" (July 2021) discusses the current status of the continuing drought. (Click here.)
