Hi Ethan,
Pairing of Nymphalidae is somewhat tricky, indeed. According to my knowledge, the normally don't mate liberally in captivity. Try hand-pairing. This may be the only way to success, however, you need some experience to execute this technique properly.
Regards,
Hi,
As Hans said Nymphalidae are tricky. I was able pair in cage many Melitaea species, some Argynnis and some Nymphalis. Urticae usually needs more time to mature, 2 weeks or more is not surprising. It should not be problem to keep adults living for close to month if properly feeded.
Also adults sometimes refuse to pair if all adults are from same offsprings stock - siblings ( same female source ).
Urticae like some level of humidity and Urtica plants should be as young as possible.
Jan
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