I had the pleaseure of being next to Glendale Gardens, Master gardeners table at the Garden's in Bloom demonstrations yesterday. A very friendly bunch, set up with piles of books, and eager to answer gardening questions. As part of the Master gardener certification the students are required to participate in 60 hours of volunteer service. You will find them at various nurseries, and garden related events around town. Don't be shy they would love the opportunity to answer your questions. If they don't have an immeadiate answer, they have the means to slueth it out for you.
They also have an online question forum.