Colorado Evergreen Advice Please - Ask Extension
We've just moved into a house in Windsor CO and are concerned about two of the trees in the backyard. One looks very unhappy with lots of yellow; th...
Knowledgebase
Colorado Evergreen Advice Please #232137
Asked March 21, 2015, 12:33 PM EDT
We've just moved into a house in Windsor CO and are concerned about two of the trees in the backyard. One looks very unhappy with lots of yellow; the other one looks like it may be headed that way. The other evergreens -- different variety -- that are very close by look fine. Don't know what kind of trees these are, how to figure out what their problem might be and how to fix it.
Larimer County Colorado
Expert Response
Hello,
Please tell me more about these trees. How long have they been planted? Or if you're not sure, when was the house built? Is there irrigation (drip) near the trees?
The "yellow" tree likely suffered damage from the extreme temperature swing we experienced in November (where the temp dropped 60-70 degrees in a 24 hour period). Here is more information: https://plantclinic.agsci.colostate.edu/files/2014/06/Polar-vortex-bulletin-Feb-2015.pdf
At this time, we are in a "wait and see" period. It's likely that the buds are still viable, though the yellow/brown needles will drop. Hold off on pruning until you see how the tree pushes growth this spring. While there may be gaps from lost needles on the branches, pruning may not be necessary.
For the other tree, do you see any sap resin or white oozing from the branch areas near the top of the tree? It's hard to determine what could be the cause from this photo. What side of the tree is this occurring on?
Please tell me more about these trees. How long have they been planted? Or if you're not sure, when was the house built? Is there irrigation (drip) near the trees?
The "yellow" tree likely suffered damage from the extreme temperature swing we experienced in November (where the temp dropped 60-70 degrees in a 24 hour period). Here is more information: https://plantclinic.agsci.colostate.edu/files/2014/06/Polar-vortex-bulletin-Feb-2015.pdf
At this time, we are in a "wait and see" period. It's likely that the buds are still viable, though the yellow/brown needles will drop. Hold off on pruning until you see how the tree pushes growth this spring. While there may be gaps from lost needles on the branches, pruning may not be necessary.
For the other tree, do you see any sap resin or white oozing from the branch areas near the top of the tree? It's hard to determine what could be the cause from this photo. What side of the tree is this occurring on?
