Here's a solution that was in the Hometalk newsletter a few days ago. I hope this helps you. Wishing you the best.
The vinegar will kill any plants or grass around where you put this, so it is best used on seams on the driveway, sidewalk and patio and not too close to what you want to keep.
Nancy is dead right: see https://www.goodhousekeeping.com/home/gardening/a20705796/vinegar-weed-killer-danger/
Hi Judy - The struggle is real, isn't it?!? This is the most effective all-natural weed killer DIY that we use. It's even been featured on Hometalk! Hope this helps! Hugs, Holly