Susie, I love my Japanese Hori Hori garden knife. Tough roots don't have a chance against it. It's so sharp, I don't have to push hard to dig or cut.
It's been so hot here that I don't think Round-up would work. I do know people who use that as their main method of weed control. Scary, I know!
Remember that children, marriages, and flower gardens reflect the kind of care they get.
H. Jackson Brown, Jr.