To keep fireflies alive, place a moistened piece of paper towel or a small piece The paper towel maintains the moisture level in the jar, and the fireflies can land on it. There's no need to feed adult fireflies because they did all their eating as larvae. Use only natural fertilizers in your garden and leave small areas of long .
Most adults never eat. They did all their eating as larvae. But don't keep them in a jar for more than two or three days. Fireflies only live a few.
Just remember that if you catch fireflies, you can keep them in a jar Adult fireflies usually live off of nectar and pollen, but some don't feed at.
In most, however, both sexes glow; often the male will fly, while females will wait An adult firefly lives only long enough to mate and lay eggs—so they may not.