How to keep weeds out of cement sidewalks
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white vinegar and water 50/50 a dab of salt and a dab of dish soap
boiling hot water on the weeds.
Get your wife to do it!
As long as there is any dirt between the slabs, you will get weeds. You can use vinegar, boiling water, round up, or pull them. You don't have any other plants in the cracks to harm.
My mother use to put salt in between the blocks after pulling the weeds.
If you choose Round up be aware that poison goes straight into our drinking water, so I would not suggest that as an option.
Vinegar and boiling water works well, but they dirt is where they take root. I would pull them up if at all possible, we also bought a weedwacker that decimates them.
I used white vinegar with salt and a little dishwashing liquid in a sprayer. Gallon of water, 2 cups salt and 4 cups vinegar, 4 tblspoons soap. I think hot water would make it work even better and pour in cracks instead of spraying to concentrate application. Good luck