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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 flowers. 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. Late summer bloom period.
- Type: Perennial
- Native
- Zone: 5-8
- Sun: Full to Part Sun
- Height: 16-36 Inches
- Spread: 12-18 Inches
- Bloom time: Midsummer-Early Fall
- Bloom Color: Blue
- Attracts: Hummingbirds, Butterflies