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I have a plague of Cottonwoods in my back yard that I'm fighting a losing battle against. I cut them down, not realizing that they would sucker horribly and now my problem is about a million times worse. The trees are on top of a 4' terrace, so a stump grinder, etc. is not an option. The trees' roots are about to ruin the block terracing and are popping up suckers as far away as 15' at ground level. I'm about to lose it.
Oh and they are infested with aphids (and thusly ants) since I lopped them off.
Is there a way I can organically poison them?
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