What type of greens? I feed collards occasionally. I find that mine wont touch them once they dry out.I keep millipedes and isopods that all need clean hardwood leaves, so a few extras can go to the dubias when needed.
My colony is still small, only 20 adults, but at least 60 first instar nymphs have been produced already. I have been testing with different foods and have found that they like fresh greens, cucumber, and apple best of all.