In my northern California coastal climate south of Diana I have found a number of Erythroniums easy to grow and flower (and in pots as well). I've started a number from NARGS seed exchanges. Some species I've sometimes gotten to germinate, but not survive to blooming stage. My climate normally gets a fair amount of winter rainfall and I've started seed in late fall to early winter and just left it outside to be rained on (no special treatment.) Seed started this way would come up four to five months later. What may be helpful in my case is that seeds that often came up in February or March were still going to have cool temperatures to grow on for a number of months. The seeds actually often come up about the time you'd expect to see older plants emerge as well. Species that flower reliably for me each year are E. californicum, E. multiscapoideum, E. helenae, E. hendersonii, E. tuolumnense. The latter took the longest of any before it started blooming (about 10 years). I find growing them in pots works better for me as I think the soil stays moist better. In the ground the redwood roots from all my trees are very greedy going after available water. The roots do get into my pots over time as well however even when I've planted pots nesting in other pots. In repotting I've pulled out redwood root nests from some pots. E. helenae was the quickest to flower (about 3 years) and is probably my most successful one so I now have it growing in multiple places (mostly in raised beds in double pots.) I looked for species that were not high elevation species. I've tried E. revolutum many times. I've gotten it to germinate without a lot of problems, but it dwindles and only once did I ever see a bloom and it was from a plant someone gave me. It hasn't rebloomed. I think I probably need to give up on it. Like Diana E. multiscapoideum is the first of mine to come up and bloom and E. revolutum the last to emerge each year. Once again we have different methods providing success. Mary Sue