David, I also live in Zone 10A but in California (hot and dry, average 10 inches of rain per year), and please IGNORE the Aussie who thinks we do not check our Zone 10A recommendations. I have been container gardening here for a couple years and am still learning, with notable mistakes being not knowing correct planting/harvesting times (I now use this website over anything on a seed package), overcrowding, and overwatering. I have successfully grown garlic in Zone 10A, from store bought garlic cloves that were sprouting tiny green shoots, and they produced but the heads and cloves were only about half the size as the original store-bought, which might be caused by the climate, or more likely from be the mistakes I was making trying to grow new things like crowding, overwatering, and not knowing when to plant or harvest. Anyway, give growing garlic a try and my best advice is to avoid overwatering. I had a lot of cloves rot instead of growing and I think it was because of overwatering. After doing more research I'm trying to grow garlic again by planting some in NOV, and some in DEC, and really monitoring the watering. Even though my garlic was half sized, it still tastes great, so I would rather have half sized garlic I can grow myself than not growing garlic.

- Dave in California Zone 10A