But I should point out that this is
Alnus incana spp. rugosa.
Alnus incana does not have the warty bark and is mostly found in uplands.
Quote:
Originally Posted by Cedars
Interesting quote:
"The presence of nitrogen-fixing, symbiotic bacteria in its root nodules makes speckled alder valuable for soil conditioning."
Sounds like an excellent conditioning plant for wetter lowlands hit hard with fertilizer runoff. Or around golf courses 
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I agree that the nitrogen fixing ability would aid in fertilizer runoff uptake, but I don't know if it would be accepted well at golf courses. As you pointed out, it is more of a shrubby tree which can form thickets (not good for golf).