Botanical name: Lobelia x gerardii
Common name: Hybrid Lobelia
Family: Campanulaceae
Origin: Southeast USA
USDA Plant Hardiness Zone Map
A hybrid between Lobelia cardinalis and Lobelia siphilitica. This is a showy and dependable edging plant that is categorized as a perennial. Thick stems grow violet-purple flowered racemes.
Prefers moist, rich soil and will continue to self-sow once established.
Similar plants: Lobelia x gerardii (Hybrid Lobelia)
Link to this plant:
https://toptropicals.com/catalog/uid/lobelia_gerardii.htm