Calendula
Calendula Officinalis
Calendula, also known as pot marigold, is a vibrant flowering plant cherished for its bright blooms and medicinal properties. Native to Europe, it thrives in sunny gardens and is often grown for its beauty and ability to attract beneficial insects.
Everything it needs
9 essentials at a glance
Watering
Calendula prefers consistently moist soil but is susceptible to root rot if overwatered.
Water when the top inch of soil feels dry, typically every 5-7 days during the growing season. In hotter months, you may need to water more frequently. Signs of overwatering include yellowing leaves and wilting, while under-watering may cause the leaves to curl and become crispy.
Light
Calendula thrives in full sun, requiring at least 6-8 hours of direct sunlight daily.
It can tolerate partial shade, especially in hotter climates, but this may reduce flowering. Ideal placement is in a garden bed or container that receives morning sun and some afternoon shade in extreme heat.
Soil
A well-draining soil mix is essential for Calendula, ideally with a pH range of 6.0 to 7.0.
A mix of loamy soil with organic matter such as compost or peat moss is recommended. Ensure good drainage to prevent waterlogging, which can lead to root rot.
Humidity
Calendula prefers moderate humidity levels around 40-60%.
To increase humidity, mist the plants or place a tray of water nearby. If humidity is too low, leaves may become crispy or develop brown edges. Conversely, high humidity can lead to fungal issues.
Temperature
Calendula thrives in a temperature range of 60-70°F (15-21°C) and is hardy in USDA zones 2-11.
It can tolerate light frost but should be protected from extreme heat above 85°F (29°C) to prevent bolting and reduced flowering.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 every 4-6 weeks during the growing season.
Avoid over-fertilizing, as this can lead to lush foliage with fewer flowers. Signs of nutrient deficiency include yellowing leaves and poor growth.
Pruning
Prune Calendula to encourage bushier growth and more blooms.
Deadhead spent flowers regularly to promote continuous flowering. Use clean, sharp scissors or pruning shears to remove faded blooms just above the first set of leaves.
Repotting
Repot Calendula when it outgrows its container, typically every 1-2 years.
Signs it needs repotting include roots growing out of the drainage holes or stunted growth. Choose a pot 1-2 inches larger in diameter and use fresh potting mix. Gently remove the plant, loosen any tightly bound roots, and place it in the new pot with fresh soil.
Propagation
Calendula can be propagated through seeds or cuttings.
For seed propagation, sow seeds directly into the soil in spring or fall, about 1/4 inch deep. For cuttings, take 4-6 inch stem cuttings in early summer, dip in rooting hormone, and plant in moist soil. Keep the cuttings in a warm, humid environment until roots develop.
When it's unhappy
Yellow leaves
Why it happens
Overwatering or nutrient deficiency.
How to fix it
Check soil moisture levels and adjust watering frequency. Fertilize with a balanced fertilizer if nutrient deficiency is suspected.
Root rot
Why it happens
Poor drainage or overwatering.
How to fix it
Ensure proper drainage in pots and soil. Allow the soil to dry out between waterings and consider repotting if root rot is suspected.
Powdery mildew
Why it happens
High humidity and poor air circulation.
How to fix it
Improve air circulation around the plant, avoid overhead watering, and apply a fungicide if necessary.
Leggy growth
Why it happens
Insufficient light.
How to fix it
Move the plant to a sunnier location to ensure it receives at least 6-8 hours of sunlight daily.
Pests (aphids, spider mites)
Why it happens
Attracts pests due to stress or poor care.
How to fix it
Inspect plants regularly, wash off pests with water, and apply insecticidal soap if infestations occur.
Care through the year
Spring
In spring, sow Calendula seeds directly in the garden or pots as the soil warms up. Ensure they receive adequate sunlight and water regularly.
Summer
During summer, keep the soil consistently moist and deadhead regularly to promote blooming. Provide some afternoon shade in extremely hot weather.
Fall
In fall, continue to deadhead and water as needed. If frost is expected, consider bringing potted plants indoors or covering them.
Winter
In winter, if grown in colder climates, protect Calendula from frost. In milder areas, they may continue to bloom; reduce watering as growth slows.
Toxicity & Safety
Calendula is generally non-toxic to pets and children, making it a safe choice for gardens. However, ingestion of large quantities may cause mild gastrointestinal upset. The sap may cause skin irritation in sensitive individuals.
Good to know
Why are my Calendula leaves turning yellow?
Yellow leaves on Calendula can indicate overwatering or nutrient deficiency. Check the soil moisture and adjust your watering schedule accordingly.
How often should I water my Calendula?
Water your Calendula when the top inch of soil feels dry, typically every 5-7 days. Adjust frequency based on weather conditions.
Can I grow Calendula indoors?
Yes, Calendula can be grown indoors if provided with sufficient sunlight, ideally 6-8 hours of direct light daily. Use a well-draining potting mix.
How do I deadhead Calendula?
To deadhead Calendula, simply pinch or cut off the spent flowers just above the first set of leaves to encourage more blooms.
What is the best fertilizer for Calendula?
A balanced fertilizer with an NPK ratio of 10-10-10 is ideal for Calendula. Fertilize every 4-6 weeks during the growing season.
When should I plant Calendula seeds?
Plant Calendula seeds in early spring or fall, as they thrive in cooler temperatures. Sow seeds directly into the garden or pots.
Is Calendula safe for pets?
Yes, Calendula is generally non-toxic to pets, making it a safe plant to have around dogs and cats.
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