Lobelia siphilitica

Common name: Great Blue Lobelia

Native plant

Great Blue Lobelia is a showy plant and produces welcome color diversity during late summer and fall, with its violet-blue spikes. It can grow in full sun but prefers part shade and wet to mesic soils. Reaching 1-4’, it’s a nice counterpoint to the mostly yellow flowers of late summer and early fall. It attracts primarily bumble bees and less often, hummingbirds.  Also commonly called blue cardinal flower.


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Plant Details

Plant type


Soil type

Mesic (Not too Wet Not too Dry), Moist Mesic, Wet

Light exposure

Full Sun, Partial Sun / Part Shade

Bloom period


Urban environment

Yards that Flood

Growth rate


Flower color



Mature height
1 Feet
Mature width
2 Feet
Max height
4 Feet
Max width
3 Feet

Additional information

Pollinator hot spot

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