Scarlet Lobelia
Lobelia cardinalis
Last reviewed: June 2026
Scarlet Lobelia is toxic to dogs and cats.
Listed as toxic by the ASPCA Animal Poison Control Center (last reviewed 2026-05-21). If your pet has been exposed, call the ASPCA Animal Poison Control Center at (888) 426-4435and your veterinarian's emergency line.
Pollinator Patch flags toxic plants so you can choose a pet-safe native alternative for your yard.
Light
part sun
Water
high
Size
12"–48" H × 12"–24" W
Bloom
Jul, Aug, Sep
Native to
AL, AR, AZ, CA and 38 more states
Pollinators
hummingbirds, bees, butterflies
Browse plants for this ecoregion
Scarlet lobelia produces brilliant red flower spikes that create striking vertical accents in the garden from summer through early fall. This moisture-loving native perennial thrives in partly shaded areas with consistent water and forms clumps of dark green foliage.
In an HOA neighborhood
Scarlet Lobelia is an HOA-friendly choice. Maintenance level: moderate. Tidiness: 4 out of 5.
Works well in: front yard, foundation, mid zone.
- Requires consistent moisture which may increase maintenance expectations
Wildlife value
The bright red tubular flowers are specifically adapted for hummingbirds, making this an excellent hummingbird magnet. Bees and butterflies also visit the blooms regularly.
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.
Pollinator Patch flags toxic plants like Scarlet Lobelia and shows pet-safe natives for your ecoregion instead.