Great Blue Lobelia
- Botanical Name
- Lobelia siphilitica
- Min Zone
- 4
- Max Zone
- 9
- Height
- 2 to 3 feet
- Width
- 12 to 18 inches
- Flowers
- July to September: raceme of 2-lipped light to dark blue held atop sturdy stems
- Light
- Full sun to part shade
- Soil
- Moist to wet
- Planting & Care
- Needs constant, consistent moisture
- Benefits from part shade in hot climates
- Divide in spring
- May self seed in optimum conditions
- Excellent for naturalizing along streams, banks, swamps and low wooded areas
- Problems
- None serious
- Varieties
- Alba - white flowers
Categories
Upcoming
Events & Webinars
August 6-16, 2026
Wisconsin State Fair
We Energies Energy Park, West Allis, WI
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August 29, 2026
Composting 102
Milwaukee Public Library - East Branch
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Sept. 3, 2026
FREE WEBINAR:
Tree Planting and Care
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Sept. 11, 2026
Illinois State Master Gardener Conference
Rockford, IL
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Sept. 12, 2026
2026 Knowledge in Bloom Conference
Urban Ecology Center, Milw., WI
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Sept. 17, 2026
FREE WEBINAR:
Fall Landscape Care and Planting
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Sept. 26, 2026
Pruning Hydrangeas & Other Shrubs
Pasquesi Home & Gardens, Lake Bluff, IL
Oct. 6, 2026
Upper Midwest Invasive Species Conference
La Crosse, WI
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