Thanks very much for ID confirmation -- appreciated!
These Ipomoea purpurea are just the common garden-type blue, pink, or white morning glories. Mine volunteer every year from seed -- very hardy and easy to raise, with a nice bloom. I can send you I. purpurea seed if you want to give them a try next year.
You might also try offering bindweed (Convolvulus arvensis) from the same family, you can find this weed in just about any neglected spot.

I checked with Dave, and he is concentrating on the larger moths and had not reared it. Thank you for your offer, but I am not a gardner and it is very arid here. We have several plants in the Convolvulaceae family on our place, so I will be looking for a good source if I get eggs. I was surprised to see that Dodder is among them and Dave has said he finds lots of caterpillars in Dodder.