For my herb garden. This one doesn't show you how to do it but looks like a good project to start! It's also great for a tiny patio or yard. Looks like the pots might be too small though. so, build frame bigger according to pot size preferred.
Cornmeal is known as a natural substitute for chemical preemergent herbicides. Using cornmeal as weed killer is a great way to eradicate weeds without the threat of toxic chemicals. Apply early spring before weed seeds sprout