|Karner blue butterflies are small, blue butterflies
having a wingspan of 22 to 32 millimeters (approximately .87 to 1.26
The butterflies usually have two broods each year. Eggs that have
overwintered from the previous year hatch in late April. These
larvae feed on wild lupine leaves and mature rapidly, pupating in
May, with adult butterflies usually emerging later in the month.
Adult Karner blue butterflies typically are in flight for the
first 10 to 15 days in June. Females lay eggs, which hatch in about
a week. The larvae feed for about three weeks before they pupate.
Adults from the second brood usually appear in the second or
third week of July and die by early August.
Before the adult females die, they lay eggs that hatch the