Always good to speak persons who have the same 'butterfly species' hobby as you
If you want, i can send some Gomphocarpus seeds to you, have got enought here, planning for danaus this year!
I want to try Rumanzovia, Bianor, Polyxenes and Lowii this year, and some Graphium Dosom, if i can get some of those.
The pupation, if it want on in the greenhouse was definately bacuase of the cold.
You should get larva above 4th instar inside, and get them there actual conditions.
I had a couple of monarchs last year, but they did not lay anye ggs at all, and they were mating like every day.
So yeah, maybe we could exchange some stuff, later this year!