This photo shows indra swallowtails on bouquets of parsley (Cymopterus terebinthinus) feeding in an open terrarium.  It's important that these terrariums have a screen lid; so that caterpillar frass can dry.  It's also critical to replace hostplant cuttings every 2-7 days depending upon the variety of your parsley.  My paper on Papilio indra goes into much more detail on the finding and caring for their larvae.