Cynthia, my rock garden woke up this spring inundated with grass volunteers, of all things! We had so much rain and cold weather that I did not attend to it until recently, and you know how that boomerangs! Any attempt I made at removal also took with it w-a-y too much soil -- and furthermore, much grass was now growing mixed in with many of the ground covers. And then one day the rains stopped, the sun came out -- and I took one look at that rock garden and screamed! Everywhere, the grass was taller than the plants! There was only one thing to do: I took a half inch paint brush and an old veggie can filled with dilute Roundup, and hand painted whatever grasses I could cautiously approach. For one week, nothing showed any reaction. After two weeks, grass began to yellow. It is now three weeks, the grass is ALL straw color -- BUT I cannot pull it out of the ground! It just does not appear to be dead ..... It is holding fast like glue. Could it be that Roundup has a limited shelf life? Could I have over-diluted it? Have you an opinion? ..........BTW, what exactly is copper shield? Penny, NY zone 6 _____________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com Or call Juno at (800) 654-JUNO [654-5866]