>>1343830Greens do fine in this setup - pic related is new collards, kale, and bok-choy. You harvest the outer leaves a little at a time and they live quite a good while, 3-4 months before bolting.
Herbs would also do fine, one bucket has my rosemary in it, and its neighbor is a young jalapeno I've been rehabilitating after it had a rough time with bugs.
Your only real limitation is how tall the plants will get, then you may have to elevate your setup a bit.