 Well, you've got the 30%. I wouldn't have bought it. I would have just bought the 20%. But since you have it, go ahead and use it. I'd use it first and just spray the Bermuda that's coming up through the mulch full strength of 30%. If you want to make it even stronger than that, you can by adding a little bit of molasses to it, an ounce of molasses per gallon of the vinegar.