25 Neptune Lupine Seeds - Purple Lupinus Variety for Spring Garden Planting

Neptune Lupine seeds produce striking purple bloom spikes that add vertical interest and vibrant color to spring gardens. This Lupinus variety is prized for its tall, densely packed flower spikes that rise above palm-shaped foliage, creating a dramatic focal point in borders, cottage gardens, and meadow plantings. The purple blooms attract pollinators and make excellent cut flowers, bringing the garden indoors.

Lupines are herbaceous perennials known for their ability to fix nitrogen in the soil, improving soil fertility for neighboring plants. With proper care, Neptune Lupine can naturalize and return year after year, forming clumps of attractive foliage and colorful spikes each spring. Start seeds indoors or sow directly in the garden for a rewarding growing experience.

Plant Features

• Tall, densely packed purple flower spikes
• Attracts bees, butterflies, and other pollinators
• Excellent for cut flower arrangements
• Nitrogen-fixing plants improve soil fertility
• Perennial in suitable climates, often naturalizes

Growing Information

• Botanical Name: Lupinus 'Neptune'
• Plant Type: Herbaceous perennial
• Sunlight: Full sun to partial shade
• Soil: Well-drained, slightly acidic soil
• Water Requirements: Moderate; keep soil moist but not waterlogged
• Growth Habit: Upright, clump-forming
• USDA Hardiness Zones: 4-8
• Bloom Season: Late spring to early summer
• Mature Height: 24-36 inches
• Germination Requirements: Scarify seeds and cold stratify for best results
• Spacing: 12-18 inches apart

Planting & Care

To improve germination, scarify lupine seeds by nicking the seed coat with a file or sandpaper, then soak in water for 24 hours before sowing. For best results, cold stratify seeds by placing them in a moist medium in the refrigerator for 4-6 weeks. Sow seeds indoors 6-8 weeks before the last frost or directly outdoors in early spring. Cover seeds lightly with soil and keep consistently moist until germination, which typically occurs in 14-30 days at 65-70°F (18-21°C).

Transplant seedlings outdoors after the danger of frost has passed, spacing them 12-18 inches apart in well-drained soil. Water regularly during establishment, then reduce frequency as plants mature. Apply a layer of mulch to retain moisture and suppress weeds. Deadhead spent blooms to encourage additional flowering and prevent unwanted self-seeding. In hot climates, provide afternoon shade to protect plants from intense heat.

What's Included

25 Neptune Lupine seeds for planting.