Hi RpR, I hope I'm replying in the right spot here... I guess I'll see after I post this! Just wanted to say thanks for your input on this- I appreciate it! Yes, weeds are certainly determined little buggers aren't they? I forgot about them being able to come up through cement! I also hadn't thought about spraying an herbicide on the mulch. I'm working on transitioning as much both indoors and out to sustainable/eco-friendly but I see they have "green" versions, so that's good for me to know! Thanks and have a pleasant week!