Works well. I grow mine in raised beds over a concrete pad. They probably average about 6 inches deep. I can grow most anything in these beds though they do need water management. If over soil instead of concrete, would require much less watering frequency. I think that garlic would do will in any container, maybe one in a quart pot, two in a gallon, four in a three gallon. I can grow a hundred or more in one of our approximately 5 x 8 beds.