- Perennial and hardy to zone 4
- Plants grow to 2 feet tall
- Spires of bright blue flowers
- Prefers sandy loam to dry sandy soil
(Lupinus perennis) 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.