Curled Dock
Rumex crispus
Curled Dock, or Rumex crispus, is a perennial herb known for its distinctive curled leaves and adaptability. Native to Europe and Asia, it is often grown for its medicinal properties and as a culinary green. Gardeners appreciate its resilience and ability to thrive in various conditions.
Everything it needs
9 essentials at a glance
Watering
Curled Dock prefers consistently moist soil, especially during its growing season in spring and summer.
Water it thoroughly when the top inch of soil feels dry, which typically translates to watering every 1-2 weeks. In the fall and winter, reduce watering frequency as the plant enters dormancy. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause wilting and leaf curling.
Light
Curled Dock thrives in full sun to partial shade, ideally receiving 6-8 hours of direct sunlight daily.
It can tolerate some shade, especially in hotter climates, but too much shade may lead to leggy growth. Position it in a spot where it can enjoy morning sun and some afternoon shade for optimal growth.
Soil
This plant prefers well-draining, loamy soil with a pH range of 6.0 to 7.0.
It benefits from a mix that includes organic matter such as compost to retain moisture while allowing excess water to drain. Ensure the pot or garden bed has good drainage to prevent waterlogging.
Humidity
Curled Dock is adaptable to various humidity levels but prefers moderate humidity.
If grown indoors, consider using a humidity tray or misting the leaves occasionally to increase humidity. Signs of low humidity stress include browning leaf tips and edges.
Temperature
Curled Dock thrives in temperatures between 60-75°F (15-24°C) and is hardy in zones 3-9.
It can tolerate colder temperatures but may die back in extreme frost. During hot summer months, ensure it has adequate moisture to prevent heat stress.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 during the growing season, applying every 4-6 weeks.
In the fall, reduce feeding as the plant prepares for dormancy. Signs of nutrient deficiency include stunted growth and yellowing leaves, indicating a need for fertilization.
Pruning
Prune Curled Dock in early spring to remove dead or damaged leaves and to encourage new growth.
Use clean, sharp scissors or pruning shears for best results. Deadheading is not necessary, but removing spent flower stalks can help maintain a tidy appearance.
Repotting
Repot Curled Dock every 2-3 years or when it becomes root-bound, indicated by roots growing out of the drainage holes.
Choose a pot that is 1-2 inches larger in diameter. Carefully remove the plant from its pot, loosen the roots, and place it in fresh potting mix, ensuring it is planted at the same depth as before.
Propagation
Curled Dock can be propagated through seeds or division.
For seed propagation, sow seeds in spring after the last frost, lightly covering them with soil. For division, carefully dig up established plants in early spring or fall, ensuring each division has roots and foliage. Replant immediately in prepared soil.
When it's unhappy
Yellowing leaves
Why it happens
This can be caused by over-watering or nutrient deficiency.
How to fix it
Check the soil moisture and adjust watering accordingly. Consider fertilizing if nutrient deficiency is suspected.
Wilting leaves
Why it happens
Wilting can occur due to under-watering or extreme heat.
How to fix it
Increase watering frequency and ensure the plant is not exposed to excessive heat without adequate moisture.
Leaf curling
Why it happens
Leaf curling can be a sign of low humidity or pest infestation.
How to fix it
Increase humidity levels or inspect for pests like aphids and treat accordingly.
Root rot
Why it happens
Root rot is caused by overly wet soil and poor drainage.
How to fix it
Ensure proper drainage and reduce watering frequency. If root rot is severe, repot the plant with fresh soil.
Stunted growth
Why it happens
This can be due to poor soil quality or nutrient deficiency.
How to fix it
Improve soil quality with organic matter and use a balanced fertilizer to provide necessary nutrients.
Care through the year
Spring
In spring, prune back any dead foliage and begin regular watering as the plant starts to grow actively. Fertilize with a balanced fertilizer every 4-6 weeks.
Summer
During summer, ensure consistent moisture, especially in hot weather. Mulching can help retain soil moisture and keep roots cool.
Fall
In fall, reduce watering as the plant prepares for dormancy. Remove any spent flower stalks and continue to monitor for pests.
Winter
In winter, minimize watering and protect the plant from frost if grown outdoors. If indoors, ensure it receives enough light and humidity.
Toxicity & Safety
Curled Dock is generally considered non-toxic to pets and children. However, ingestion of large quantities may cause stomach upset. Avoid consuming the plant without proper knowledge, as some parts may be mildly irritating.
Good to know
How often should I water my Curled Dock?
Water Curled Dock every 1-2 weeks, allowing the top inch of soil to dry out between waterings. Adjust frequency based on seasonal changes.
What type of soil is best for Curled Dock?
Curled Dock thrives in well-draining, loamy soil with a pH of 6.0 to 7.0. Adding organic matter like compost can enhance soil quality.
Can I grow Curled Dock indoors?
Yes, Curled Dock can be grown indoors if it receives adequate sunlight, ideally 6-8 hours daily. Ensure it has enough humidity and moisture.
What are the signs of nutrient deficiency in Curled Dock?
Signs include yellowing leaves, stunted growth, and poor overall vigor. Regular fertilization during the growing season can prevent deficiencies.
Is Curled Dock invasive?
Curled Dock can be invasive in some areas, spreading quickly through seeds and rhizomes. Regular maintenance and control measures may be necessary.
How do I propagate Curled Dock?
Curled Dock can be propagated by seeds or division. Sow seeds in spring or divide established plants in early spring or fall for new growth.
What pests affect Curled Dock?
Common pests include aphids and spider mites. Regularly inspect the plant and treat infestations with insecticidal soap or neem oil.
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