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Lobelia siphilitica (Cardinal Flower/Blue Lobelia)

Blue Lobelia, has deep blue flowers crowded along the upper section of 2 to 3 feet tall spires and makes an impressive show in the perennial garden where it attracts hummingbirds.

Blue Lobelia plants were used medicinally by native Americans. These plants prefer average to moist rich soil and make a striking contrast in color when planted near red Cardinal Flower. Blue Lobelia & Red Lobelia can be grown in large pots partially submerged in a water garden. Lobelia siphiliticata Blue Lobelia seeds are very small and will germinate without pretreatment.

Lobelia siphilitica (Blue Lobelia) is a richly colored native wild flower that grows wild in prairies, open woods, wet meadows, and moist soil along ponds and stream banks over most of the Midwest and Eastern US. Provides late summer bloom to the perennial border, wild garden, native plant garden, woodland garden or naturalized planting. Also effective near ponds or streams.

All of our woodland plants grow naturally on rich, moist forest floors and are perfectly suited for your garden. Add them to an existing wooded area or create your own woodland garden. Dappled shade and humus-rich soil provide perfect growing conditions.


# Description Qty per Unit Units Available Price/Unit
NF160 Lobelia siphilitica (Cardinal Flower/Blue Lobelia) out of stock $0.00

Plant Details +

Size #1
Height 5'
Spacing 12-18"
Hardiness Zones 4-9
Exposure Part shade to part sun
Foliage Green
Flower Blue Spires
Bloomtime July-Sept

General Information +

Botanical: Lobelia siphilitica

Common: Cardinal Flower/Blue Lobelia

Family: Campanulaceae

General Characteristics: Lobelia 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 forming a dense terminal raceme atop stiff, unbranched, leafy stalks typically rising 2-3' tall. Finely-toothed, lance-shaped, light green leaves (to 5" long). Late summer bloom period. Species name of siphilitica arose from a prior medicinal use of the plant in the treatment of venereal disease. Also sometimes commonly called blue cardinal flower. The brilliant flowers have earned the plant a place in cultivation and it is becoming quite common.

Planting/Care Instructions +

Pests or Diseases: No serious disease or insect problems.

Planting Instructions: Easily grown in rich, humusy, medium wet to wet soils in light shade to full sun. 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. Mulching helps to keep the roots moist. Be careful not to allow fallen leaves to smother next season's rosettes. Dig a hole large enough to hold the roots. If any roots seem tightly bound, loosen before planting. Fill the hole with water and position the plant so the crown (where the roots meet the stem) is just slightly below the soil line. Fill the hole with soil and water again.