Seed Exchange - Lupine’s dense spires of bright blue flowers signal the coming of spring. Lupine is the only food plant for the larvae of the endangered Karner Blue butterfly. Plants grow 2' tall on sandy loams to very dry sandy soils. Will not grow well in clay soils. Perennial. Hardy to zone 4.
Perennial and hardy to zone 4
Plants grow to 2 feet tall
Spires of bright blue flowers
Prefers sandy loam to dry sandy soil
Instructions - Germination is greatly increased by a 7-day cold treatment in a slightly damp paper towel in a plastic bag in the refrigerator. Cold-treated seeds can be directly sown in spring or early summer. Untreated seeds can be sown outdoors in fall.
Sow 1/4" deep
Germination 14-60 days
Thin 12-15" apart
Firefly Farm & Mercantile may substitute seed vendors from time to time because of availability