I have found that at Ace hardware, they have a product called Kilz All. You should be able to get a quart for around $24.95. It is mixed 2 oz per gallon of water and it works a lot better than RoundUp or any other brand and works out to be cheaper to use. It will kill every thing it comes in contact with even small oak trees. You can plant with in 12 hours. Just thought I would share this with you.