Bummer. I will not plant Aspens. It's all I can do to keep aphids off my roses!
I don't think Aspens will grow in Central Illinois, so I guess I'm safe from making that mistake. (not that I haven't made plenty.)
This is just a guess but are aspens found In Colorado?
Wikipedia sez Populus tremuloides is a deciduous tree native to cooler areas of North America, one of several species referred to by the common name Aspen. It is commonly called quaking aspen,Which may be our problem - cooler areas - a stressed tree is a tree more prone to disease and bugs.
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