Burdock
Arctium Lappa
Burdock (Arctium lappa) is a versatile biennial plant known for its edible roots and medicinal properties. Native to Europe and Asia, it thrives in well-drained soil and full sun, making it a popular choice for home gardens.
Everything it needs
9 essentials at a glance
Watering
Burdock prefers consistently moist soil, especially during its growing season.
Water deeply once a week, allowing the top inch of soil to dry out between waterings. In hot summer months, increase frequency to twice a week. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause wilting and leaf drop.
Light
Burdock thrives in full sun but can tolerate partial shade.
Ideally, it should receive 6-8 hours of direct sunlight daily. In regions with extremely hot summers, some afternoon shade can help prevent leaf scorch.
Soil
Burdock prefers well-draining, loamy soil with a pH range of 6.0 to 7.0.
It benefits from organic matter, so mixing in compost or well-rotted manure is recommended. Ensure good drainage to prevent waterlogging, which can lead to root rot.
Humidity
Burdock prefers moderate humidity levels, around 40-60%.
To increase humidity, consider misting the leaves or placing a humidity tray nearby. Signs of low humidity include browning leaf tips and stunted growth.
Temperature
Burdock grows best in temperatures between 60°F to 75°F (15°C to 24°C).
It is hardy in USDA zones 3-9. It can tolerate light frost but may struggle in extreme heat, so provide some shade during peak summer temperatures.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10.
Fertilize every 4-6 weeks during the growing season, starting in early spring. Signs of nutrient deficiency include yellowing leaves and poor growth, indicating a need for additional feeding.
Pruning
Pruning is not typically necessary for burdock, but removing dead or damaged leaves can promote better air circulation.
Use sharp, clean scissors or pruning shears. Deadheading is not required as burdock is grown primarily for its roots.
Repotting
Burdock is usually grown in the ground, but if grown in containers, repot every 2-3 years or when roots become crowded.
Signs it needs repotting include roots growing out of the drainage holes or stunted growth. Choose a pot 2 inches larger in diameter and refresh the soil during repotting.
Propagation
Burdock can be propagated by seed or root division.
For seed propagation, sow seeds directly in the garden in early spring after the last frost. For root division, dig up established plants in early spring or fall, ensuring each division has a healthy root system. Replant immediately in well-prepared soil.
When it's unhappy
Yellow leaves
Why it happens
This can be caused by over-watering or nutrient deficiency.
How to fix it
Adjust watering habits and consider fertilizing if nutrient deficiency is suspected.
Root rot
Why it happens
Overly wet soil and poor drainage can lead to root rot.
How to fix it
Ensure proper drainage and allow the soil to dry out between waterings.
Pests (aphids, slugs)
Why it happens
Aphids and slugs are attracted to burdock, especially in moist conditions.
How to fix it
Use insecticidal soap for aphids and handpick slugs or use organic slug bait.
Stunted growth
Why it happens
This can be due to poor soil quality or insufficient sunlight.
How to fix it
Improve soil with organic matter and ensure the plant receives adequate sunlight.
Browning leaf tips
Why it happens
This is often a sign of low humidity or underwatering.
How to fix it
Increase humidity levels and ensure consistent watering.
Care through the year
Spring
In spring, sow seeds directly in the garden after the last frost. Fertilize with a balanced fertilizer to promote strong growth.
Summer
During summer, ensure consistent watering, especially in hot weather. Monitor for pests and provide shade if temperatures soar.
Fall
In fall, prepare to harvest roots. Cut back any dead foliage and consider mulching to protect the roots from frost.
Winter
In winter, if grown in containers, move burdock indoors or to a sheltered location to protect it from harsh frost. If in the ground, mulch around the base to insulate the roots.
Toxicity & Safety
Burdock is generally non-toxic to pets and children. However, excessive consumption of the leaves may cause stomach upset. The roots are edible and commonly used in culinary dishes.
Good to know
Why are my burdock leaves turning yellow?
Yellowing leaves on burdock can indicate over-watering or a nutrient deficiency. Check the soil moisture and consider fertilizing if necessary.
How often should I water my burdock plant?
Water burdock deeply once a week, increasing to twice a week during hot summer months. Always allow the top inch of soil to dry out between waterings.
What kind of soil does burdock prefer?
Burdock 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 burdock in a pot?
Yes, burdock can be grown in containers, but ensure the pot is large enough (at least 12 inches in diameter) to accommodate its root system.
When is the best time to harvest burdock roots?
The best time to harvest burdock roots is in the fall of the first year or early spring of the second year, when they are most tender and flavorful.
Is burdock safe for pets?
Burdock is generally non-toxic to pets. However, excessive consumption of leaves may cause stomach upset, so it's best to monitor their intake.
Grows well with
Related care guides
Explore remedies
Track this plant in your garden.
Set care reminders, log growth, and join a community of plant lovers.