Lobelia siphilitica
Great Blue Lobelia

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Deer ResistantRain GardenPart ShadeBird Friendly
Great Blue Lobelia
Lobelia siphilitica

The spikes of brilliant true blue flowers on this wetland native attract butterflies, hummingbirds and neighbors to your garden! Lobelia siphilitica provides outstanding color for the border, wet meadow or pond edge. Naturalizes easily in moist soils, but tolerates periods of drought.

Perfect for grouping as a tall, colorful backdrop
Summer-long native butterfly nectar source
A favorite bloom for visiting hummingbirds
Thrives in moist to wet soils
Long, colorful blooming season
Vigorous and easy to grow

Native Range

Wet meadows and stream banks from the Atlantic coast west through the Dakotas, Colorado and Wyoming, excluding Florida

Interesting Facts

This plant is unusual because of its dependence on pollination by the ruby throated hummingbird. The roots of cardinal flower were part of a Native American love potion. Powder made from the entire plant was used as a magic dust to dispel storms.


Grow in average to moist soil in full sun to part shade. Grows best in wet, moist organically rich soil in shady areas. Mulch to keep soil moist.

Mature Size: 30-36in. Tall x 18-24in. Wide

Hardiness Zone: 4-9

Sun Exposure: Part Shade

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