Safe for St. Augustine grass?

Question

Are sugar and vinegar safe to use on St. Augustine grass?

Answer 1

You could spot-treat weeds with vinegar, but I would advise against using vinegar on your entire lawn because vinegar is non-selective and would probably burn the grass. In fact, vinegar is touted as a means to kill grass naturally on our website:
https://www.gardeningknowhow.com/plant-problems/weeds/how-to-kill-grass-naturally-kill-unwanted-grass-in-your-yard.htm

Sugar, on the other hand, is probably okay. You can read more about sugar weed control at the following link:
https://www.gardeningknowhow.com/special/organic/using-sugar-to-kill-weeds.htm