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I bet if you take a sprig of it to a local plant store, they can ID it and give you some suggestions for how to eradicate it.

Depending on how hearty it is, a basic lawn weed killer (NOT like...

Here is Prickly Ash:
http://uvalde.tamu.edu/herbarium/final/zahi_br.jpg

I'm reading that Prickly Ash has greenish-yellowish flowers.

Whatever it is I'd think one of two things:
Either a mama...