PlantFun
Plant Needs
Sunlight
Full sun to partial shade; tolerates afternoon shade in hot, arid climates to prevent leaf scorch
Watering
Water deeply when the top 5 cm of soil is dry; avoid overwatering to prevent root rot
Temperature
Hardy to light frosts; protect from temperatures below 0°C; thrives in warm temperate growing conditions
Characteristics
- Leaf: Ovate, serrated leaves with anise-like fragrance when crushed
- Flower: Tubular cobalt-blue blooms with deep black-purple calyxes; arranged in terminal spikes
- Stem: Erect, square green stems typical of the mint family
Care Guide
Watering
Keep soil consistently moist but not waterlogged; increase frequency during prolonged heatwaves
Fertilization
Apply diluted balanced fertilizer every 4 weeks. Cease fertilization in late autumn to support natural dormancy
Banana peel compost tea：Soak fully composted banana peels in water for 24 hours; dilute 1:20 for root drench; discard solids to avoid pest infestations and odorPruning
- Deadhead spent flower spikes regularly to encourage continuous blooming
- Cut back stems to 15 cm above soil level in late winter to promote vigorous new spring growth
- Thin overcrowded clumps every 2–3 years to improve airflow and reduce disease risk
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Non-toxic to cats; no known adverse effects from ingestion
Humans: Non-toxic to humans; leaves may be used in herbal teas in small quantities
Garden Uses & Culture
Culture: Associated with wisdom and remembrance in some Western floral symbolism traditions
Usage: Pollinator garden staple; cut flower for floral arrangements; edible leaves for herbal teas
