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My paver patio was weed free for several years after I built it. Eventually, dust and dirt collected in the cracks and weeds began to grow.
I tried many things to kill weeds. About a year ago I began experimenting with salt. It's not perfect but so far this has been the most successful solution I've found. Salt kills weeds, keeps them dead a long time and so far I have not seen any salt damage to my pavers.
Note: In the right dose salt kills every plant it comes in contact with. Don't use this method if there is risk to plants you want to keep alive. Salt dissolves in water so check where water goes when it rains.
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