How to safely prevent weeds from growing between cracks in concrete?

Make a mixture of white vinegar and water 50/50 add a dab of dish soap and salt

I strong mixture of salt water in a garden sprayer. Saturate the weeds with the mixture.

I use the white vinegar to wet them, especially the roots; then shake salt all over them. I do this early in the morning on a day that's going to be bright sunshine. They usually turn brown and are simple to pull out in a day or 2. If they don't try again on a hotter day.

Baking soda!!

Salt water in a sprayer. Just be sure not to get it on plants you like

Boiling water

Rock salt where you need it then wet it down

I use white vinegar with a bit of salt

pour boiling water on them it will kill them

Bleach

I just boil the kettle and pour the hot water over the weeds. They die.

Hi there, something a little different is to celebrate the cracks by putting mosaic tiles inside the cracks. You can grout the mosaics with an outdoor grout to seal