PlantFun
Plant Needs
Sunlight
Full sun exposure preferred; tolerates partial shade during intense midday heat
Watering
Water deeply when the top 2 cm of soil dries out; drought-tolerant once established
Temperature
Hardy to subzero winter temperatures; avoid prolonged heat above 28°C
Characteristics
- Leaf: Silvery-green, spiny lanceolate leaves with woolly, white undersides
- Flower: Purple globular thistle heads surrounded by sharp, spiny bracts
- Stem: Short, hairy, unbranched or sparsely branched stems
Care Guide
Watering
Keep soil slightly moist during active growth periods
Fertilization
Diluted balanced liquid feed once monthly. Use low-nitrogen feed to promote compact growth and flowering
Crushed eggshell powder：Mix a thin layer into topsoil in early spring to boost soil alkalinity; avoid over-application to prevent nutrient buildupPruning
- Deadhead spent flower heads to encourage extended blooming
- Remove yellowing foliage in late autumn to reduce disease risk
- Thin overcrowded clumps every 2–3 years to improve airflow and growth
Toxicity
Warning: this plant may be toxic.
Pets & Humans
Pets: ASPCA: Non-toxic to cats; no reported adverse effects
Humans: No known toxic effects to humans
Garden Uses & Culture
Culture: N/A
Usage: Ornamental alpine garden plant; nectar source for bees and butterflies
