Well, Northern California is a big place, oraganic :-) You need to give us your Sunset zone (see my "Zone" entry) and the city you live in. It really depends where you live, and how cold it gets in your area, as well as how warm your summers are. You would want to check out your local large garden centers or citrus nurseries for citrus trees, including Valencia orange trees. You'll then need to decide how large a tree you're after. A tree grafted onto standard rootstock, which can get as tall as 20 feet, or a tree grafted onto semi-dwarfing rootstock, or even dwarfing rootstock. Depends how much room you have for a tree, and how many citrus trees you'd like to plant. Forget seeds, it will take years for the tree to produce fruit. You're much better off with a two or three year's of growth. You'll have fruit within a year or two. Get yourself to you best local garden center, start talking with knowledgeable folks there about what citrus varieties will do the best in your area, as we have many many micro-climates in California, and your local garden center associate should know your area specifically, and can tell you about your climate, and whether or not it will support citrus.

Patty S.