Just anything useful. That’s why I said I might just do dandelions. Leaves and flowers are edible and I have a recipe for wine. LOL
Lambsquarters is a pretty common weed in most of the US. Both the seeds and the leaves are edible. It’s sometimes nicknamed “wild quinoa” because, well, they’re the wild form of quinoa.
There are several common weeds that are medicinal herbs. Pleurisy root, a form of milkweed, is an antiviral. So is elderberry. Mullein is good for coughs, and the leaves can be smoked as a tobacco substitute.
Nettle is a detoxifying herb, and the stem fibers can be used to make rope or fabric, much the way hemp is used.
Burdock roots can be eaten their first year. It’s actually a popular vegetable in Japan.
Chances are, you’ve already got something useful growing :)