Mike wrote:

http://www.ortho.com/index.cfm/event...8627e685fc3a8b
Sounds just like roundup. I hear silca sand in the cracks works well.


Actually, it's very different than Roundup. While Roundup also kills
just about everything, you can safely replant a week later. The above
type product not only kills, but keeps anything from germinating for 6
months to a year. It's designed for driveways, walkways, etc.