Chinese Foxglove
Rehmannia Glutinosa
Rehmannia glutinosa, commonly known as Chinese Foxglove, is a versatile perennial valued for its medicinal properties and attractive flowers. Native to China, it thrives in moist, well-drained soils and partial shade, making it a popular choice for garden enthusiasts.
Everything it needs
9 essentials at a glance
Watering
Rehmannia glutinosa prefers consistently moist soil but should not be waterlogged.
Water the plant thoroughly when the top inch of soil feels dry, typically every 1-2 weeks. In the growing season, increase frequency to once a week, while in winter, reduce to every 2-3 weeks. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause wilting and leaf drop.
Light
This plant thrives in partial shade to full sun, ideally receiving 4-6 hours of sunlight daily.
It can tolerate some direct sunlight, especially in the morning, but too much intense afternoon sun can scorch the leaves. Ideal placement includes a location that receives filtered sunlight or dappled shade.
Soil
Rehmannia glutinosa prefers well-draining, loamy soil with a pH range of 6.0 to 7.0.
A mix of potting soil, compost, and sand works well to ensure proper drainage. Avoid heavy clay soils that retain too much moisture.
Humidity
This plant enjoys moderate humidity levels around 50-70%.
To increase humidity, consider misting the leaves or placing a humidity tray filled with water and pebbles beneath the pot. Signs of low humidity include browning leaf tips and leaf drop.
Temperature
Rehmannia glutinosa thrives in temperatures between 60-75°F (15-24°C).
It is hardy in USDA zones 5-9 and can tolerate light frost but should be protected from extreme cold. In summer, it can handle warmer temperatures but may require some shade during heatwaves.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 during the growing season, applying every 4-6 weeks.
In fall, switch to a low-nitrogen fertilizer to prepare the plant for dormancy. Signs of nutrient deficiency include stunted growth and yellowing leaves.
Pruning
Prune Rehmannia glutinosa in early spring before new growth begins.
Use clean, sharp pruning shears to remove any dead or damaged stems. Deadheading spent flowers can encourage more blooms and improve overall appearance.
Repotting
Repot every 2-3 years or when the roots become crowded.
Choose a pot that is 1-2 inches larger in diameter. Signs it needs repotting include roots growing out of the drainage holes or stunted growth. To repot, gently remove the plant from its pot, loosen the roots, and place it in fresh potting mix.
Propagation
Propagation can be achieved through seed sowing or division.
For seeds, sow them in spring after the last frost, covering lightly with soil. Keep the soil moist until germination occurs in 2-4 weeks. For division, carefully separate established clumps in early spring, ensuring each division has roots and foliage.
When it's unhappy
Yellow leaves
Why it happens
Usually caused by over-watering or nutrient deficiency.
How to fix it
Check soil moisture and reduce watering frequency. Fertilize with a balanced fertilizer if nutrient deficiency is suspected.
Wilting leaves
Why it happens
Typically a sign of under-watering or root rot.
How to fix it
Ensure consistent watering and check for root rot by inspecting the roots. If rot is present, remove affected roots and repot in fresh soil.
Brown leaf tips
Why it happens
Often due to low humidity or underwatering.
How to fix it
Increase humidity by misting or using a humidity tray, and ensure regular watering.
Stunted growth
Why it happens
Can be a result of poor soil quality or nutrient deficiency.
How to fix it
Repot in fresh, nutrient-rich soil and apply a balanced fertilizer to encourage growth.
Pests (aphids, spider mites)
Why it happens
Common in dry conditions or overcrowded plants.
How to fix it
Inspect regularly and treat infestations with insecticidal soap or neem oil.
Care through the year
Spring
In spring, prune back any dead foliage and prepare for new growth. Fertilize with a balanced fertilizer to support active growth.
Summer
During summer, ensure consistent watering and provide some shade during the hottest part of the day to prevent leaf scorch.
Fall
In fall, reduce watering as the plant enters dormancy and switch to a low-nitrogen fertilizer to prepare for winter.
Winter
In winter, protect the plant from frost and reduce watering to every 2-3 weeks. Ensure it is in a cool, dry location.
Toxicity & Safety
Rehmannia glutinosa is considered non-toxic to pets and children. However, ingestion of large quantities may cause mild gastrointestinal upset. Always consult a medical professional if ingestion occurs.
Good to know
How often should I water my Rehmannia glutinosa?
Water your Rehmannia glutinosa when the top inch of soil feels dry, typically every 1-2 weeks, adjusting for seasonal changes.
What type of soil is best for Chinese Foxglove?
A well-draining loamy soil with a pH of 6.0 to 7.0 is ideal for Rehmannia glutinosa, ensuring good drainage to prevent root rot.
Can I grow Rehmannia glutinosa indoors?
Yes, it can be grown indoors, provided it receives adequate light and humidity. A bright windowsill with filtered sunlight is ideal.
What temperature does Rehmannia glutinosa prefer?
This plant thrives in temperatures between 60-75°F (15-24°C) and can tolerate light frost but should be protected from extreme cold.
How do I propagate Rehmannia glutinosa?
You can propagate it through seeds sown in spring or by dividing established clumps in early spring, ensuring each division has roots.
Why are my Rehmannia glutinosa leaves turning yellow?
Yellowing leaves can indicate over-watering or nutrient deficiency. Check soil moisture and consider fertilizing if needed.
What pests should I watch for on my Chinese Foxglove?
Common pests include aphids and spider mites. Regularly inspect your plant and treat infestations promptly with insecticidal soap.
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