Answer: Maple trees are very resiliant and very capable of regenerating from the root reserves. Depending on how large these trees are you might have better success by thoroughly digging out the roots, or by having them ground down to about two feet deep or more. This would allow you to replant the area much sooner than waiting for the wooden stump and roots to rot down. You could also kill them using an herbicide containing glyphosate, be sure to read and carefully follow all of the label instructions. I would not recommend copper sulfate -- which inhibits rooting. Copper sulfate is sometimes used in sewer lines to kill tree roots but it is not currently recommended for that usage either as it then is carried in either runoff or in the biosolids in the sewer treatment system.
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