You should be able to find them at most nurseries. The big box stores typically carry a selection of Australian plants (Grevillea Noelli, Grevillea Red Hooks, Callistemon "Little John," Callistemon citrinus, Eremophila... etc) If you want a wider and more specific selection, you'll have to find a specialty nursery, which I'm sure there are plenty of in the area. I live in Northern California and we have a large selection of Hakeas, Grevilleas, Corymbia, Eucalyptus, Doryanthes and many, many more at select nurseries. Southern California will have even more availability I'm sure. I know Australian Native Nursery in Ventura specializes in Australian plants but it is too far away for you unless you'll have an entire day to spare. Good luck! Welcome to the Golden State!

Nitrogen draw down is a significant problem for your vege patch that contains 'hungry' shallow rooted annual, biannual and short lived perrenial plants. But even here you can compensate by liberally sprinkling blood and bone over the soil surface before laying the green mulch.

i keep australian reptiles, and am setting up a new display, i am after small plants of spinifex, sand sage and other small herbs and grasses to preserve and use for my new setup. John

many pretty flowers are 'sports' or special mutations. sometimes the plant 'reverts' to its species form. I suspect this is what has happened to yours. If you don't like it, dig it out and plant a new on. The one at our front door is a dull yellow too, perhaps it was meant to be something else. I've never heard of this happening though. cymbidiums are notorious for this apparently. http://en.wikipedia.org/wiki/Back_mutation another possibility is that these are just the dead flowers.