There's no such thing as a braodleaf killer that won't hurt your tree eventually.
With baby oaks, I just pull them if they're in a planting bed, or mow them when they're in the lawn. There really won't be a problem doing it that way.
Tony has a good idea, though, to verify these are form acorn, not from the ends of roots trying to start a new tree.
_________________ Shepherd of the Trees
It is not our part to master all the tides of the world, but to do what is in us for the succor of those years wherein we are set, uprooting the evil in the fields we know so that those who live after may have clean earth to till.
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