Great Blue Lobelia Seeds - Lobelia siphilitica Native Blue Flowers (500 Seeds)

Great Blue Lobelia (Lobelia siphilitica) is a native perennial prized for its spikes of vibrant blue flowers that bloom from late summer into fall. This clump-forming plant brings a splash of cool color to moist meadows, rain gardens, and woodland edges, and its nectar-rich blooms are highly attractive to hummingbirds and butterflies.

Easy to grow from seed, Great Blue Lobelia is an excellent choice for naturalistic plantings, pollinator gardens, and damp areas where other plants may struggle. Its upright habit and striking blue flowers make it a standout in borders and water-wise landscapes.

Plant Features

• Produces tall spikes of vivid blue, tubular flowers
• Attracts hummingbirds, butterflies, and native bees
• Thrives in moist to wet soils, perfect for rain gardens
• Blooms from late summer through early fall
• Native to North America and deer-resistant

Growing Information

• Botanical Name: Lobelia siphilitica
• Plant Type: Herbaceous perennial
• Sunlight: Full sun to partial shade
• Soil: Moist to wet, well-drained soil
• Water Requirements: Moderate to high; keep soil consistently moist
• Growth Habit: Upright, clump-forming
• USDA Hardiness Zones: 4-9
• Bloom Season: Late summer to early fall
• Mature Height: 2-3 feet
• Spacing: 12-18 inches apart

Planting & Care

Sow Great Blue Lobelia seeds indoors 6-8 weeks before the last frost or directly outdoors in fall. Press seeds lightly into the soil surface; they need light to germinate. Keep the growing medium consistently moist and maintain a temperature around 65-75°F (18-24°C). Germination typically occurs in 14-30 days.

Once seedlings have several true leaves, transplant them outdoors after the danger of frost has passed. Choose a location with moist, rich soil and partial shade, especially in hotter climates. Water regularly to keep the soil evenly moist, and mulch to retain moisture. Great Blue Lobelia may self-sow in favorable conditions. Divide clumps every 2-3 years to maintain vigor.

What's Included

500 Great Blue Lobelia (Lobelia siphilitica) seeds.