PlantFun
Plant Needs
Sunlight
Full sun to partial sun; thrives in bright, direct sunlight for most of the day, tolerates light afternoon shade in hot climates
Watering
Water deeply when top 5-7 cm of soil is dry; drought-tolerant once established, avoid overwatering to prevent root rot
Temperature
Hardy to -15°C; withstands moderate summer heat, protect from prolonged extreme frost in very cold regions
Characteristics
- Leaf: Gray-green, ovate to lanceolate leaves with soft pubescence, aromatic when crushed
- Flower: Dense clusters of vibrant deep blue tubular flowers at stem tips
- Stem: Slender, woody stems with silvery-green foliage accents
Care Guide
Watering
Water regularly to establish root system; reduce frequency once fully established
Fertilization
Apply balanced slow-release fertilizer once at new growth onset. Avoid heavy nitrogen fertilization, which can reduce flower production
Eggshell powder top-dressing：Crush dried eggshells into fine powder; sprinkle lightly on soil surface; water in gently to release calcium gradually without causing nutrient burnPruning
- Prune back to 10–15 cm above ground in early spring to encourage bushy, compact growth
- Deadhead spent flower clusters promptly to prolong the blooming period
- Remove thin, weak stems in mid-summer to improve airflow and maintain plant form
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Non-toxic to cats; no reported toxicity
Humans: Non-toxic to humans; no known adverse effects from ingestion or contact
Garden Uses & Culture
Culture: N/A
Usage: Ornamental border plant; pollinator-friendly for bees and butterflies; container specimen
