Blue Lobelia
Lobelia siphilitica
Last reviewed: June 2026
Light
part sun
Water
high
Size
12"–36" H × 12"–18" W
Bloom
Jul, Aug, Sep
Native to
AL, AR, CO, CT and 34 more states
Pollinators
bees, hummingbirds
Browse plants for this ecoregion
Blue lobelia produces tall spikes of brilliant blue flowers from summer through early fall, creating striking vertical accents in the garden. This native perennial thrives in consistently moist soil and partial sun conditions. The plant forms neat clumps with lance-shaped green leaves that complement the showy flower displays.
In an HOA neighborhood
Blue Lobelia is an HOA-friendly choice. Maintenance level: moderate. Tidiness: 4 out of 5.
Works well in: front yard, foundation, street edge, mid zone.
- Requires consistent moisture to maintain appearance
Wildlife value
The tubular blue flowers are particularly attractive to hummingbirds and also support various native bees. This plant provides valuable late-season nectar when many other flowers have finished blooming.
Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Does Blue Lobelia fit your yard? Open it in Pollinator Patch to check it against your sun, soil, and HOA-conscious filters.