I think that was one of my big problems - packed soil. I'm not sure how it ended up so packed because it wasn't like that when i planted, and it's in my herb bed, but when i dug them up i thought i was going to break my hand trowel!
Unfortunately i'm limited in my locations to grow my garlic. I lived downtown with a small lot and do my gardening in a community garden that gets plowed over ever year in the spring. Maybe i'll tear out my husbands asparagus bed and turn it into a garlic bed!