Cardoon (Cynara cardunculus)

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Sunlight Full sun to partial afternoon shade; tolerates hot, dry summer conditions

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Watering Water deeply when top 5–7 cm of soil dries out; avoid overwatering to prevent root rot

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Temperature Hardy to -10°C; thrives in temperate to warm Mediterranean climates

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Leaf: Large, deeply lobed, silvery-gray pubescent leaves forming dense basal rosettes
Flower: Thistle-like purple composite flower heads atop tall, rigid stems
Stem: Thick, fleshy branching stems with small spiny bracts near flower clusters

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Watering

Keep soil consistently moist during active growth; apply mulch to retain moisture

Fertilization

Apply balanced organic feed every 4 weeks. Avoid high-nitrogen feeds to prevent excessive leaf growth at the expense of edible stems

Composted eggshell powder：Crush fully composted eggshells into fine powder; mix into topsoil to boost soil calcium levels without nutrient burn

Pruning

Remove yellowing basal leaves to improve airflow and reduce disease risk
Deadhead spent flower heads to prevent unwanted self-seeding
Cut back stems to ground level after flowering in late autumn to encourage new spring growth

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Warning: this plant may be toxic.

Pets & Humans

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

Humans: Edible stems and leaves; minor skin irritation possible from spiny bracts in sensitive individuals

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Culture: Symbolizes resilience in Mediterranean horticulture; historically used as a medicinal herb for digestive support

Usage: Edible fleshy stems and young leaves; ornamental garden foliage for textural contrast