Host Plant for Karner Blue Butterfly Lupine (Lupinus perennis)
is the only known food plant for caterpillars of the Karner Blue
Butterfly, a federally-endangered species native to the Great
Lakes region. Unmistakable spires of blue flowers are a spring
favorite! This Grows in dry sandy soils where most other plants
would perish. Will not grow in loam or clay. Hardy to Zones 3 -
8.