Here is an herbicide that is safe to use in your garden—vinegar. Now, table vinegar won’t work. It has a concentration of 4-5%. You need to buy 30% vinegar which you will find at Home Depot or Lowes. The thing is, you can reduce the percentage to 20% and it will still be very effective. Dilute the 30% by adding 1 part water to 2 parts vinegar and you will get 20%. I have been testing vinegar spray at the Rock Garden and have found it to be deadly on everything but Bermuda grass. You will find that one application will kill weeds in a very short period of time.
Stan, The Spraying Man