Plant guide

Broad-leaved dock.

Rumex obtusifolius

Pronounced ROO-mex ob-too-sih-FOH-lee-us

Also known as Bitter Dock, Broad-Leaved Dock, Broad-leaved Dock, Bitter Dock, Broadleaf Dock

This hardy perennial is often found growing in pastures and along roadsides. It is known for its deep taproot and ability to thrive in various soil conditions. You will likely recognize it by its large, wavy leaves and tall seed stalks.

At a glance

Care level: Easy
Plant type: Perennial herb
Light: Full sun to partial shade
Indoor light: Direct sun
Water: Every 3 to 7 days
Mature size: 1 to 1.5 meters
Growth rate: Fast

Care

This plant is quite resilient and generally requires little attention once established. Watch for rapid spread in garden beds as it can become invasive. Keep an eye on the seed heads to prevent unwanted seedlings from popping up.

Watering: Keep the soil consistently moist but not waterlogged.
Feeding: Apply a balanced fertilizer during the growing season if soil quality is poor.
Pruning: Remove seed stalks before they mature to prevent the plant from spreading.
Repotting: Repot only if the plant becomes root-bound in a container.
Soil: Moist, nutrient-rich soil
Soil pH: 5.5 to 7.0

Safety

Pets: This plant contains soluble oxalates which can be toxic to cats and dogs if ingested in large quantities.

How to identify it

Large, broad, heart-shaped basal leaves
Wavy leaf margins
Tall, reddish-brown seed stalks
Deep, thick taproot

Science

Family: Polygonaceae
Genus: Rumex
Order: Caryophyllales
Class: Magnoliopsida

Taxonomy resolved against GBIF.

Also in

Plants toxic to cats and dogs

Is your broad-leaved dock looking unwell?

This page is a general guide. Pocket Botanist diagnoses problems from a photo of your actual plant, works out watering for your light and conditions, and reminds you when care is due.

Get the app

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.