Great Blue Lobelia (Lobelia siphilitica) is an easy way to add late-season blue to moist parts of your landscape. You will see upright stems topped with tubular, two-lipped flowers from midsummer into fall, a magnet for bumblebees and other pollinators and often visited by hummingbirds.

Give it consistently moist to wet soil for best performance. It is well suited to rain gardens, pond edges, streamside plantings, and low spots that stay damp, and it can also work in average garden beds if you keep it watered through summer heat. Plant it in full sun to part shade; more sun is fine where soil stays evenly moist, while filtered light can help in warmer sites.

Expect clumps to reach about 24-36 inches tall, with a narrow footprint that fits well among other perennials. Use it in naturalized drifts, meadow-style borders, and mixed native plant beds, and let some spent flower stalks mature if you want it to reseed lightly in the right conditions.

Keep plants looking tidy by removing browned lower leaves if needed and cutting stems back after flowering or after frost. Divide clumps in spring if they become crowded. As with many lobelias, plant parts are not for eating, so place it where pets and children are unlikely to browse.

Specifications

• Cold hardiness zone: 4-9 (-30 degrees F) - Contact your local extension to confirm hardiness if you are in a fringe zone (we cannot guarantee hardiness in fringe zones)
• Light: Full sun   Part sun
• Mature height: 24-36"
• Spread: 18-24"
• Tolerant of: Wet Conditions
• Attracts: Butterflies, Hummingbirds
• Long bloom time: Yes
• Native to the U.S.: Yes

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