Yellow Thistle (Cirsium erisithales)

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Sunlight Full sun to partial sun; thrives in exposed, open areas; tolerates light shade in hot summer climates

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Watering Drought-tolerant; water deeply only during prolonged dry spells; avoid overwatering to prevent root rot

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Temperature Hardy to -10°C; withstands hot, dry summer temperatures; requires cold stratification for successful seed germination

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Leaf: Spiny, lanceolate to oblong leaves with toothed margins, covered in fine white hairs
Flower: Bright yellow spherical capitula with spiny basal bracts
Stem: Erect, hairy stems with scattered small spines

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Watering

Water only when top 5cm of soil is completely dry; avoid waterlogging

Fertilization

Optional diluted compost tea once monthly to support blooming. Do not apply high-nitrogen fertilizers, as they may reduce flower production

Composted banana peel tea：Steep fully composted banana peels in water for 24 hours; dilute 1:20 with water for root drench to avoid nutrient burn

Pruning

Deadhead spent flower heads to encourage additional summer blooms
Cut back stems to ground level in late autumn to promote healthy regrowth the following spring
Remove any diseased or damaged foliage promptly to prevent spread of pathogens

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Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats; no reported adverse health effects

Humans: No known systemic toxicity to humans; mild skin irritation may occur from contact with spines

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Culture: N/A

Usage: Pollinator-friendly wildflower; supports bees, butterflies, and other beneficial insects