Wild lupine

Lupinus perennis

The only host of the endangered Karner blue butterfly; loves sandy soil.

Type: herb or perennial · native and wild plants
Hardiness: zones 3 to 8
Light: full sun
Size: about 2 ft tall, 1.5 ft wide
From: E. North America
Drought-hardy once established
Here: Hardy in the Lake Erie shore climate (zone 6b to 7a), so it can live outdoors in the ground.

Good for: fixing nitrogen in the soil, pollinators, butterfly and moth caterpillars.

Native to: Northeast, Midwest & Great Lakes, Eastern Canada. Hardy in zones 3 to 8.

The story

Wild lupine is the only plant the caterpillar of the Karner blue butterfly will eat. As the sandy oak openings where lupine grew were built over, the butterfly nearly vanished with it. Planting lupine in sandy places is part of bringing it back.

Planting

Full sun and sandy, acid, poor soil. Scratch the seed and sow it in fall where it is to grow.

Growing

Don't fertilize, don't mulch heavily, and don't move it: the taproot is long and brittle.

Harvest and use

Blue spires in May for bumblebees, and a host plant for Karner blue, frosted elfin and wild indigo duskywing butterflies.

What to watch for

Western and hybrid garden lupines are different plants and no use to the Karner blue. Check the Latin name.

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More native and wild plants

General guidance, not professional advice. Conditions vary by yard and year; for local specifics ask your county extension office. Never eat a wild plant you cannot identify with certainty. Traditional uses are shared as history, not medical advice. © 2026 Sean Priest · Irie Orchard. Terms & credits · Privacy · Home