How to Grow Lupine

Lupine 

Lupinus polyphyllus

Lupine produces tall, upright flower spikes with strong stems that are well suited for cutting in late spring to early summer. 

Once established, plants form sturdy clumps that produce reliably each season. Stems are best harvested when flowers are just beginning to open on the spike for the longest vase life and cleanest presentation.

Details

Plant type: perennial

Height: 24-40”

Site: sun/part shade

Days to maturity: 150-190 days

Plant spacing: 12”

Pinch: not necessary

Kids & Pets: poisonous, resistant to deer

Transplant (recommended):
Start seeds indoors 4–8 weeks before planting out. Use deep cell trays (32-cell or deep 50-cell) to support taproot development. Thin to one plant per cell at first true leaves. Seedlings tolerate light frost. Harden off well and transplant promptly, as root restriction reduces stem quality.

Direct seed:
Sow early spring as soon as soil can be worked. Cover seeds with ¼″ soil, as darkness aids germination. Keep soil evenly moist.

Germination:
14–21 days at 65–75°F (18–24°C).

Where to plant:
Full sun to part shade in moist, well-drained soil. Slightly acidic soil preferred.

Harvesting / Vase Life:
Harvest when about 80% of florets on the spike are open. Cut early for best hydration. Expect a vase life of 5–6 days.

In the landscape:
Plants reach 24–40″ tall and should be spaced 18–24″ apart. Remove spent blooms to support continued production.