Thanks Natalie, I'm in the same position as you. I have a west facing hillside that leads down to a field and pond. We previously ran cows on it, but now have torn down the fences and are letting it revert to nature. I, too, envision of beautiful hillside of wildflowers, I've also flung my share of seed at it, and mostly have just grasses (which are lovely in the wind) and a very few field daisies. I diligently saved seed from both California and field poppies last year, tossed some in the fall and some in the spring - so far nada. As with Natalie, I do not plan to water or weed this area so it needs to be tough and durable. A major obstacle is the seed will need to wiggle down between the existing grass to find soil. I've got lots of buttercups, which I don't mind, but they are probably also a hindrance to other plants colonizing. I'd love to get some native lupine established and foxgloves at the wood edges. When we have mole infestations, I use that opportunity to plant directly in the newly hilled dirt. A work in progress...