Fireflies flash according to the intensity of surrounding light. On dark nights, they flash often and late into the night. They won't flash much when there is a bright full moon or if there's too much artificial light.
TO ATTRACT FIREFLIES:
~~ Reduce the amount of lighting on your property because external lights interfere with the firefly's mating ritual.
~~ Change your outdoor lighting to lights that operate as a motion detector so they don't produce continuous light.
~~ Install lights that are low to the ground and that point straight down instead of shining in all directions.
~~ Don't use bug zappers because they can also kill beneficial insects. Instead, install bat or purple martin houses, or bring frogs into your garden to eliminate mosquitoes and other insect pests.
~~ Don't use chemical fertilizers, or broad spectrum pesticides. which can poison fireflies and other beneficial insects. Use compost, compost tea, and fish and seaweed mixes instead. If you decide you must use pesticides, use an organic one or insecticidal soap. Look for lighting bugs before you spray.
~~ Adult fireflies rest during the day in tall grass, vegetation, or low tree branches so they can stay cool. If your yard gets dry, you could add a bird bath or fountain to the area where they're likely to be living.
~~ Firefly larvae eat earthworms, snails and other soft bodied animals, which live in rich, organic soil. If you have a manicured lawn, create a small area for a firefly habitat.
Photo by anneh632 on flickr.