PlantFun
Plant Needs
Sunlight
Full sun to partial shade; tolerates dry, sunny exposed sites with minimal shade
Watering
Drought-tolerant; water deeply only when top 5–7 cm of soil is completely dry; avoid overwatering to prevent root rot
Temperature
Hardy to light frost; thrives in cool to warm temperate climates with low humidity
Characteristics
- Leaf: Basal rosette of lanceolate, hairy leaves with prominent veins; stem leaves are smaller, alternate
- Flower: Dense terminal spikes of funnel-shaped blue-purple blooms, fading to pink as they age
- Stem: Erect, bristly, green to reddish-brown stems branching near the top
Care Guide
Watering
Water deeply every 7–10 days during active growth and flowering
Fertilization
Diluted balanced liquid feed once monthly. Avoid high-nitrogen fertilizers which can reduce flowering
Eggshell powder topdressing：Crush dried eggshells into fine powder; sprinkle lightly on soil surface to improve drainage and boost calcium levels without overfeedingPruning
- Deadhead spent flower spikes promptly to limit self-seeding (it may become invasive in some regions)
- Trim back leggy stems in early spring to encourage bushier, more compact growth
- Remove yellowing basal leaves to improve airflow and reduce pest habitat
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Toxic; ingestion may lead to liver toxicity, lethargy, and vomiting
Humans: Contains pyrrolizidine alkaloids; chronic ingestion may cause liver damage
Garden Uses & Culture
Culture: N/A
Usage: Ornamental for wildflower gardens; historically used in folk medicine but not recommended due to toxic alkaloid content
