I have done it for years here in northwest California, and it is very
possible. In fact, there is no need to irrigate garlic at all in our
climate because the time the Garlic needs water is during our rainy
season, and the time the bulbs are drying down, June-July are
ordinarily completely dry. I plant in October (I better get on it!)
and harvest in July. The only problem I have are gophers, which must
be trapped vigilantly if you got 'em. I hope this helps.
Dan