How to Grow Lupins
Perennial. The pea-like flowers of lupins grow in dense spires from their destinctive foliage. They will bloom 2 months from a spring sowing or early summer from fall sown plants.
Season & Zone
Exposure: Full sun to partial shade
Sow indoors 6-8 weeks before last frost, around mid to late February on the coast. If starting indoors, use peat or coir pots to limit root disturbance. Lupins work equally well direct sown in early spring (mid-March on the coast) when some risk of frost is still possible. Can be direct sown in autumn where winters are mild.
If starting indoors, stratify seeds by chipping or soaking in water for 24 hours prior to sowing. Sow shallowly a couple of millimeters (1/8″) deep, and maintain a coolish soil temperature of 12-18°C (55-65°F). Seeds should germinate in 14-60 days. Be patient.
After flowering, cut down the stems to the base of the plant. You can divide these big plants in early Spring to propagate certain colours. Self-sown plants will revert to pale blue.