Well burnout I gotta admit thats probly one of the cutest questions i have ever seen asked here.

if you have already been using it, and the plant hasn't died, it will be fine.

If you havent used it, go ahead and use it. antiseptic mouthwash is actually great for lawns and flowers when used with baby shampoo and ammonia and beer.

(this will by the way drought proof your lawn to a degree )

HAPPY WATERING