Those undersized bulbs would be considered "eating-cloves". The rule of thumb is to use the largest cloves to plant since those cloves will generally produce the largest bulbs. My pots are 24" in diameter and probably 20" deep. The vast majority of what I grow are in a raised garden though. I did not plant any garlic in pots last fall. I planted late and did not have the number of cloves I would have liked.
