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The simplest way to kill plant roots organically is to physically dig them up. Some persistent weeds can re-emerge from the rootlets left in the soil, but if you dig them up again and again eventually they won't have the resources to re-emerge. Another method is called soil solarization, but this can only be used in smaller areas, and it has to be done in the three hottest months of the summer. What you do is till the soil, and remove as much plant matter as possible, then water the area thoroughly, and spread a layer of thick, clear plastic over it, anchoring the edges of the plastic firmly by berming soil over the edges. Leave it on for three months or so, or even longer if you live in a northern climate, and that should completely sterilize the soil.

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17y ago

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