PlantFun
Plant Needs
Sunlight
Full sun to partial shade; thrives in exposed, dry sites and tolerates poor soil conditions
Watering
Drought-tolerant; water only during prolonged dry spells to avoid waterlogging
Temperature
Hardy to -15°C; withstands cool temperate winters and warm summer temperatures without damage
Characteristics
- Leaf: Spiny, lanceolate leaves with woolly white undersides; basal leaves form a low rosette
- Flower: Large spherical purple flower heads surrounded by densely woolly, spiny bracts
- Stem: Erect, hairy stems with narrow spiny wings running along their length
Care Guide
Watering
Water occasionally during extended dry periods to support flower development
Fertilization
Optional diluted, low-nitrogen feed once monthly if soil is very poor. No regular fertilization required for established plants
Crushed eggshell top-dress：Sprinkle finely crushed, dried eggshells around the base of plants to boost soil calcium levels; avoid direct contact with stems to prevent irritationPruning
- Remove spent flower heads in late summer to encourage self-seeding (optional)
- Cut back dead foliage to ground level in late winter to tidy the planting area
- 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
Humans: No documented toxicity to humans
Garden Uses & Culture
Culture: N/A
Usage: Ornamental wildflower; supports pollinators including bees, butterflies, and hoverflies
