Jack-in-the-pulpit (Arisaema triphyllum)

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Sunlight Dappled woodland shade; avoid direct midday sun which can scorch foliage

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Watering Keep soil consistently moist but not waterlogged; avoid allowing the root zone to dry out completely

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Temperature Hardy to -30°C in dormancy; prefers cool 15–22°C temperatures during active growth

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Leaf: Trifoliate, glossy green leaflets with ovate to lanceolate shapes
Flower: Hooded green spathe with purple stripes enclosing a central spadix ("Jack")
Fruit: Dense cluster of bright red berries ripening in late summer

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Watering

Maintain even soil moisture; apply mulch to reduce evaporation

Fertilization

Apply diluted organic feed once monthly. Use low-nitrogen feed to promote flowering rather than excessive foliage growth

Composted leaf mold tea：Steep fully composted leaf mold in water for 24 hours; dilute 1:20 for root drench to enrich soil without burning roots

Pruning

Remove spent spathes after flowering to redirect energy to berry production
Cut back yellowing foliage in late autumn after dormancy begins
Thin overcrowded clumps every 3–4 years in early spring to improve air circulation

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Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Toxic; ingestion leads to oral irritation, drooling, vomiting, and dysphagia

Humans: Contains calcium oxalate crystals; ingestion causes oral pain, swelling, and difficulty swallowing

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Culture: Symbolizes hidden wisdom and woodland mystery; used cautiously in traditional Native American medicine

Usage: Ornamental woodland garden plant; roots are edible only after repeated boiling to neutralize toxins