PlantFun
Plant Needs
Sunlight
Full sun to partial shade; tolerates dry, poor soil conditions and moderate heat
Watering
Allow top 2–3 cm of soil to dry between waterings; drought-tolerant once established
Temperature
Hardy to -15°C; withstands moderate summer heat without stress
Characteristics
- Leaf: Narrow, linear grey-green leaves arranged in whorls along upright stems
- Flower: Snapdragon-like purple blooms clustered in dense terminal spires
- Stem: Slender, upright green stems with fine, hairless texture
Care Guide
Watering
Keep soil evenly moist during active growth; avoid overwatering
Fertilization
Apply diluted balanced feed once monthly. Avoid over-fertilizing, as it prefers nutrient-poor soil conditions
Eggshell powder top-dress：Crush dried eggshells into fine powder; sprinkle lightly around base of plants in early spring to boost soil calcium levels without over-fertilizingPruning
- Deadhead spent blooms regularly to encourage continuous flowering throughout summer
- Cut back stems to ground level in late autumn to tidy garden borders
- Thin overcrowded clumps every 2–3 years in early spring to improve airflow and reduce disease risk
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Non-toxic to cats
Humans: No known toxic effects on humans
Garden Uses & Culture
Culture: N/A
Usage: Ornamental garden plant; attracts pollinators like bees and butterflies
