I think I am having some beginner's luck with growing my Bearss Lime tree in a pot. I'd like to grow more of the citrus plants (preferably oranges/mandarins). Any recommendations for a newbie like me? I'd have to grow them in pots, and am looking for a variety that is cold tolerant to our zone 9 winters, which also puts out a good yield. The gardener at my local nursery seems to suggest that orange trees don't particularly give good produce in Northern California climates?