Water Dock Plant Care

Water Dock (Rumex hydrolapathum) belongs to the Polygonaceae family within the Rumex genus. Water Dock is native to fens and freshwater banks of Europe and Western Asia. Water Dock is also known as Great Water Dock, Water Sorrel.

Water Dock displays a clumping perennial growth habit, reaching up to 2 ft tall with a spread of approximately 1.5 ft. Water Dock produces small green flowers on tall spikes.

Leaf size: approximately 6 inches.

Rumex hydrolapathum requires watering every 4–7 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.

Water Dock thrives in full sun to part shade.

Rumex hydrolapathum grows best at temperatures of 50–75°F. Water Dock prefers humidity levels of 40–70%.

Moist, fertile soil with good drainage. Good drainage is essential for Water Dock to prevent waterlogging, which leads to root rot and fungal issues.

Feed Water Dock every 6 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.

Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.

The PlantoScan app can remind you when to water and when to fertilize each plant.

Divide clumps every 2-3 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.

Water Dock can be propagated through seeds, division. Similar propagation techniques also apply to alpine dock plant care, which shares the same genus.

See all plants toxic to cats and plants toxic to dogs.

Water Dock is susceptible to aphids, leaf miners, slugs. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.

Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.

Water Dock grows outdoors in USDA Zone 5a – 9b. It survives winters down to planting zone 5a. Water Dock is native to fens and freshwater banks of Europe and Western Asia.