My basic yard has a great feature of a stone walk-way that was installed before I bought the house. Stones are laid out about 1 inch apart. The grass and weeds growing in between are out of control. I've dug out each space before. Is there a permanent way (chemical?) to get rid of it? I'm also thinking about pulling up rocks, laying down weed block and gravel then putting them back down, but it would be a huge task? Thanks!!