I bought a plant of corydalis lutea several years ago and it has self-seeded all around. It is very colourful and extremely long-blooming, growing in shade, part sun and even dry soil. It is not easy to transplant unless one digs up very small plants without disturbing the rootball. See link below. It is native to the southern Alps in Europe, but naturalized in N. America. Your local nurseries or hort. club sales may have plants, as it is becoming quite common, if you can't find seeds.

Here is a link that might be useful: corydalis lutea

Gardens North has seeds for several different varieties of corydalis. Their on-line catalogue states that most corydalis seed is ephemeral, and they send it fresh packed. Last April, I placed an order for some natve plant seeds, when they had discount. I think I will wait a little bit and see if they offer a discount this year.

herbthyme, sent you a message but not sure you got it. I have corydalis seeds. Soft pink with yellow tips. Let me know if you're interested in trading. I sent you another email for another request you had for veg/herbs as well.

Hi trillium15,
Didn't get your 1st message. Yes i would be interested in trading. Am sending you an e-mail.

Thank you trilliam15 for the corydalis seeds, it has been a pleasure.