// SPECIES PROFILE · PERENNIAL · NATIVE

Blue Lobelia

Lobelia siphilitica

Blue Lobelia (Lobelia siphilitica) is a perennial in the Campanulaceae family. Native range includes AR, KS, MO, OK. Hardy in zones 4a–9a. Mature size 2'–3'. Blooms Jul–Sep.

// QUICK FACTS

Family: Campanulaceae
Group: perennial
Native range: Native to 38 U.S. states, including AL, AR, CO, CT, DC, DE…
USDA hardiness: Zones 4a–9a
Mature size: 2'–3'
Sun: Sun to part shade
Water: —
Bloom: Jul–Sep
Wildlife value: High — pollinator and wildlife support
Ecological role: blue cardinal flower · hummingbird plant · wet soil native

Blue Lobelia (Lobelia siphilitica) — *Lobelia siphilitica* — Blue Lobelia. Photo by Eric Hunt via Wikimedia Commons (CC BY-SA 4.0).

Field Notes

[ growing · ecology · siting · care ]

Blue Lobelia (Lobelia siphilitica) is a perennial in the Campanulaceae family. Native range includes AR, KS, MO, OK. Hardy in zones 4a–9a. Mature size 2'–3'. Blooms Jul–Sep.

Why it's on this list: blue cardinal flower · hummingbird plant · wet soil native. Native-range data from the Lady Bird Johnson Wildflower Center (NPIN), cross-checked against iNaturalist observations. Part of Rooted Revival's regional native plant catalog — true natives for Oklahoma, Arkansas, Missouri and Kansas.

Companion Planting

[ guild · polyculture · cross-layer pairings ]

In the same native range, blue lobelia pairs naturally with: Broadleaf Arrowhead (Sagittaria latifolia), Gray Goldenrod (Solidago nemoralis), Great Blue Lobelia (Lobelia siphilitica), Lady Fern (Athyrium filix-femina).