Lobelia siphilitica

Lobelia siphilitica


Lobelia siphilitica


Lobelia siphilitica, commonly called great lobelia or blue cardinal flower, is a native perennial which typically grows in moist to wet locations along streams, sloughs, springs, swamps, meadows and in low wooded areas. A clump-forming perennial which features light to dark blue, tubular, 2-lipped flowers with the three lobes of the lower lip appearing more prominent than the two lobes of the upper lip. Flowers arise from the upper leaf axils, and have a late summer bloom period.



Easily grown in rich, humusy, medium to wet soils in full sun to part shade. Needs constant moisture. Will tolerate full sun in cool, northern climates, but otherwise appreciates part shade. Divide clumps in spring as needed. May self-seed in optimum growing conditions, forming attractive colonies.


Type: Herbaceous perennial

Family: Campanulaceae

Zone: 4 to 9

Height: 2.00 to 3.00 feet

Spread: 1.00 to 1.50 feet

Bloom Time: July to September

Bloom Description: Blue

Sun: Full sun to part shade

Water: Medium to wet

Maintenance: Low

Flower: Showy

Tolerate: Deer, Heavy Shade, Wet Soil

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