Hi! I've been trying to grow artichokes in Portland (green globe variety from the Portland Nursery), the plants have produced only one or two tiny fruits each. They seem afflicted with something like powdery mildew.

What's strange to me is I've seen huge thriving plants in some gardens around town, though the fruits look a bit unusual.
This plant was spotted near Mount Tabor; anyone know what variety it might be? Is it even an artichoke at all? Any advice on good varieties and growing techniques? Thanks!

Thanks! I'm sure you're right about the cardoon. That explains a lot.