I grow garlic in containers. It is just like in ground gardening except in a container. Garlic gives very little problems. Just keep it watered when dry, but do not overwater so it's soggy. A good application of compost in the planting mix helps a great deal and organic fertilizer is good also. I use aged horse manure lightly scratched in the suface when the garlic sprouts and a small amout of blood/bone meal. That's about all there is to it. Sit back and let it grow until it's ripe, then harvest.