curly dock.

Rumex crispus L.

Pronounced ROO-mex KRIS-pus

Also known as Curled Dock, Curly Dock, Narrowleaf Dock, Sour Dock, Yellow Dock, curly-leaved dock

Curly dock is a hardy perennial often found in disturbed soil and meadows. It is well known for its deep taproot and distinctive wavy leaf edges. You will often see it standing tall with reddish brown seed stalks in late summer.

At a glance

Care level: Easy
Plant type: Perennial herb
Light: Full sun
Indoor light: Direct sun
Water: Every 3 to 7 days
Mature size: 3 to 5 feet
Growth rate: Fast
Hardiness: USDA 3 to 9
Bloom time: Late spring to summer

Care

This plant thrives in moist soil and full sun. Keep an eye out for aphids on the flower stalks. Ensure the soil remains consistently damp for the best growth.

Watering: Keep the soil consistently moist but not waterlogged.
Feeding: Apply a balanced liquid fertilizer during the active growing season.
Pruning: Remove spent flower stalks to prevent unwanted seed spread.
Repotting: Repot only if the plant becomes root bound in its container.
Soil: Moist, fertile, well-draining soil
Soil pH: 5.0 to 7.5
Temperature: -30 to 35°C
Humidity: 30 to 80%

Safety

People: The plant contains soluble oxalates that can cause kidney stones or irritation if ingested in significant amounts.
Pets: This plant contains soluble oxalates which can be toxic to cats and dogs if ingested in large quantities.
Children: The plant is not inherently dangerous to touch, but ingestion of large amounts of leaves should be avoided.
Contact allergens: The leaves can cause mild skin irritation in sensitive individuals.
Airborne allergens: The windborne pollen is a significant allergen for many people during the summer months.
Edibility: Young leaves are edible when cooked, but they contain high levels of oxalic acid which can be harmful if consumed in large quantities.

How to identify it

Wavy or curled leaf margins
Deep taproot system
Tall reddish brown seed stalks
Lance shaped basal leaves
Small greenish flowers in clusters

Height: 0.6 to 1.5m
Spread: 0.3 to 0.6m
Leaves: green, deciduous
Flowers: green, red, 0.2 to 0.5cm
Fruit: brown, rust, Late summer to autumn

Problems to watch for

Dock BeetleCommon
RustCommon
AphidsUncommon
Leaf SpotUncommon

By symptom

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Growing it

Propagation: seed
When to plant: spring, autumn

This plant is often best kept in a wilder area of the garden due to its aggressive seeding habit.

Grows well with

Dandelion — Both species thrive in similar disturbed soil conditions.

Similar species

Broadleaf Dock — It is a closely related species with broader, less wavy leaves.

Science

Family: Polygonaceae
Genus: Rumex
Order: Caryophyllales
Class: Magnoliopsida
Native range: Europe, Western Asia, and North Africa.
Conservation: It is considered a widespread weed and is not of conservation concern.

It thrives in disturbed soils and damp areas, often acting as a pioneer species.

Value to wildlife: larval host plant, seed source for birds
Pollinators: bees, butterflies, beetles
Uses: culinary greens, foraging, soil remediation

Through the year

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Flowering

Fruiting

Foliage

Ecological indicators

Salinity: 3/9
Nutrients: 7/9
Soil reaction: 5/9
Light: 7/9
Temperature: 5/9
Moisture: 6/9

Taxonomy resolved against GBIF.

Questions people ask

Is it invasive?: It is considered a naturalized weed in many parts of the world.
Can I eat it raw?: It is best to cook the leaves to reduce the oxalic acid content.

Where the name comes from

Rumex is the ancient Latin name for this plant, while crispus refers to the curled or wavy margins of the leaves.

Good to know

It is often called curly dock due to the wavy edges of its leaves.
The roots were historically used in herbal medicine.
It is a very successful colonizer of disturbed ground.

Also in

Plants toxic to cats and dogs

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This guide was generated with AI and checked against GBIF taxonomy. It is general information, not horticultural or veterinary advice. Read about how we build these guides.