Long-leaved Dock (Rumex longifolius)

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Sunlight Full sun to partial shade; tolerates dry, low-nutrient conditions without significant stress

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Watering Water deeply when top 2–3 cm of soil is dry; drought-tolerant once established with a mature taproot

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Temperature Hardy to -20°C; tolerates hot summer temperatures up to 30°C with adequate soil moisture

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Leaf: Long, lanceolate to linear leaves with smooth margins, up to 30 cm long; basal rosette growth
Flower: Tiny greenish-white clustered flowers on branching upright spikes
Stem: Erect, grooved green stems with minimal branching below flower spikes

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Watering

Keep soil moderately moist during active growth and flowering

Fertilization

No regular fertilization needed; optional diluted compost tea once monthly. Fertilization is not required for established wild populations

Composted eggshell powder：Sprinkle a thin layer around the base of plants; avoid direct contact with leaves to prevent burning and nutrient buildup

Pruning

Deadhead spent flower spikes to prevent excessive self-seeding and unwanted spread
Trim back yellowing basal leaves in early spring to encourage fresh new growth
Cut back entire plant to ground level after flowering to promote a second flush of foliage

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Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Non-toxic to cats; no known adverse effects from ingestion

Humans: No significant toxicity; young leaves may contain low oxalate levels that are neutralized by cooking

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Culture: N/A

Usage: Edible young leaves (cooked to reduce oxalate content); traditional medicinal use for minor skin irritations