The AHS registration database indicates that there have been 54 daylily cultivars registered with citrina in their ancestry. It is fertile but I suspect that it is nocturnal and strongly self-incompatible. It may abort most hand pollinations that are made in the morning because night-flying moths have already self-pollinated it.

Thank you Maurice. I should have checked AHS first.

I am still looking for my lemon yellow cultivar that appears and disappears. Likely it is descendant of citrina. I bought it labelled ''Lemon Yellow'' but appears to be unregistered. It smells divine so hope it is just still dormant. So far I have had a few deciduous cultivars survive and thrive here in subtropical Australia. We haven't had a frost in the last 2 years. A few registered as SEvs viz. MARCIA FAY, MAKING A SPLASH, wh is stunning, are completely deciduous which helps me battle against rust.

Bron, it is very pollen and pod fertile.