Persistent Tree Roots
by Don
(Waynesville, nc)
Doug says there are a lot of chemicals you can use to kill roots but none I'd recommend using - given that all are serious ground poisons and will pollute terribly. Anything you put down will migrate across to your perennial roots given the nature of water and material movement in soils. It's like putting creosote down and expecting nothing bad to happen to the soil or water there. For example, if you put down creosote to kill off tree roots - it will migrate into the perennial areas and kill off the perennial roots as well.
This is a problem of growing under trees in the shade and one we all deal with on a yearly basis. There is no "permanent" cure other than to cut down the trees.
Your own system is probably as good as you're going to get.
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