Foxglove
Digitalis Purpurea
Digitalis purpurea, commonly known as Foxglove, is a stunning biennial plant celebrated for its tall spikes of tubular flowers. Native to Europe, it adds elegance to gardens and attracts pollinators, making it a popular choice among gardeners.
Everything it needs
9 essentials at a glance
Watering
Digitalis purpurea prefers consistently moist soil, especially during its growing season in spring and summer.
Water deeply once a week, allowing the top inch of soil to dry out between waterings. In hotter months, you may need to water more frequently. Signs of over-watering include yellowing leaves and root rot, while under-watering can lead to wilting and browning leaf edges.
Light
Foxglove thrives in partial shade to full sun, ideally receiving 4 to 6 hours of sunlight daily.
In hotter climates, some afternoon shade can help prevent leaf scorch. It tolerates a range of light conditions but prefers bright, indirect light for optimal growth.
Soil
The ideal soil for Digitalis purpurea is rich, well-draining loamy soil with a pH range of 6.0 to 7.0.
Ensure good drainage to prevent waterlogging, which can lead to root rot. A recommended potting mix includes compost and perlite to enhance aeration and moisture retention.
Humidity
Foxglove prefers moderate humidity levels, ideally between 40% to 60%.
To increase humidity, mist the leaves regularly or place a humidifier nearby. Signs of low humidity stress include browning leaf tips and wilting flowers.
Temperature
Digitalis purpurea thrives in temperatures between 60°F to 75°F (15°C to 24°C).
It is hardy in USDA zones 4 to 9, tolerating light frost but not extreme heat. In summer, ensure it has some shade to protect it from excessive heat.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10, applying every 4 to 6 weeks during the growing season.
In fall, reduce feeding as the plant enters dormancy. Signs of nutrient deficiency include yellowing leaves and poor flowering.
Pruning
Prune Digitalis purpurea after flowering to encourage new growth and prevent self-seeding.
Use clean, sharp pruning shears to remove spent flower spikes and any dead or damaged foliage. Deadheading can promote a tidier appearance and prolong blooming.
Repotting
Repot Foxglove every 2 to 3 years or when it becomes root-bound.
Signs it needs repotting include roots growing out of the drainage holes and stunted growth. Choose a pot that is 1-2 inches larger in diameter, and refresh the soil during the process.
Propagation
Propagation can be achieved through seeds or division.
For seed propagation, sow seeds in early spring or fall, covering lightly with soil. Keep the soil moist until germination, which takes 2 to 3 weeks. Division can be done in early spring or fall by carefully separating the roots and replanting them in new locations.
When it's unhappy
Yellow leaves
Why it happens
This can be caused by over-watering or nutrient deficiency.
How to fix it
Check the soil moisture and reduce watering if necessary. Fertilize with a balanced fertilizer to address nutrient deficiency.
Root rot
Why it happens
Root rot is often caused by poor drainage or over-watering.
How to fix it
Ensure the pot has adequate drainage holes and reduce watering frequency. Remove affected roots and repot in fresh soil if necessary.
Wilting flowers
Why it happens
Wilting can occur due to under-watering or high temperatures.
How to fix it
Increase watering frequency during hot weather and provide some shade if temperatures exceed 80°F (27°C).
Powdery mildew
Why it happens
This fungal disease thrives in high humidity and poor air circulation.
How to fix it
Improve air circulation around the plant and apply a fungicide if necessary. Avoid overhead watering to reduce humidity on the leaves.
Pests (aphids, spider mites)
Why it happens
Pests can infest the plant, especially in dry conditions.
How to fix it
Inspect regularly and treat infestations with insecticidal soap or neem oil. Maintain humidity to deter spider mites.
Care through the year
Spring
In spring, ensure consistent watering as the plant begins to grow. Fertilize with a balanced fertilizer to support new growth.
Summer
During summer, monitor for wilting and increase watering if necessary. Provide some shade during extreme heat to protect the plant.
Fall
In fall, reduce watering as the plant prepares for dormancy. Prune spent flowers and consider dividing the plant if needed.
Winter
In winter, protect the plant from frost by mulching around the base. Reduce watering significantly as the plant enters dormancy.
Toxicity & Safety
Digitalis purpurea is toxic to pets and humans. All parts of the plant contain cardiac glycosides, which can cause symptoms such as nausea, vomiting, and heart irregularities if ingested. Keep out of reach of children and pets.
Good to know
How often should I water my Foxglove?
Water your Foxglove once a week, ensuring the top inch of soil dries out between waterings. Adjust frequency based on weather conditions.
Why are my Foxglove leaves turning yellow?
Yellow leaves can indicate over-watering or nutrient deficiency. Check soil moisture and consider fertilizing if necessary.
Can I grow Foxglove in full sun?
Yes, Foxglove can grow in full sun but prefers partial shade, especially in hotter climates. Ensure it receives 4 to 6 hours of sunlight daily.
When should I prune my Foxglove?
Prune your Foxglove after flowering to encourage new growth and prevent self-seeding. Remove spent flower spikes and any dead foliage.
Is Foxglove toxic to pets?
Yes, Foxglove is toxic to pets and humans. All parts of the plant contain harmful compounds that can cause serious health issues if ingested.
How do I propagate Foxglove?
You can propagate Foxglove through seeds or division. Sow seeds in early spring or fall, or divide the roots in early spring or fall for new plants.
What is the ideal temperature for Foxglove?
Foxglove thrives in temperatures between 60°F to 75°F (15°C to 24°C) and is hardy in USDA zones 4 to 9.
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