White Horehound
Marrubium Vulgare
White Horehound (Marrubium vulgare) is a hardy perennial herb known for its medicinal properties and aromatic leaves. Native to Europe, it thrives in sunny gardens and is often grown for its culinary and therapeutic uses. This resilient plant is easy to care for, making it a popular choice among herb enthusiasts.
Everything it needs
9 essentials at a glance
Watering
Water White Horehound moderately, allowing the top inch of soil to dry out between waterings.
In the growing season (spring and summer), water every 1-2 weeks, reducing frequency in the fall and winter. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause wilting and dry leaf edges.
Light
White Horehound thrives in full sun, requiring at least 6-8 hours of direct sunlight daily.
It prefers a south-facing location but can tolerate partial shade, especially in hotter climates. Avoid placing it in full shade, as this can lead to leggy growth.
Soil
This plant prefers well-draining soil with a pH range of 6.0 to 7.0.
A sandy or loamy potting mix is ideal, and adding perlite or coarse sand can enhance drainage. Ensure the pot has drainage holes to prevent water accumulation.
Humidity
White Horehound prefers moderate humidity levels, around 40-60%.
To increase humidity, mist the leaves or place a humidifier nearby. Signs of low humidity include browning leaf tips and increased susceptibility to pests.
Temperature
The ideal temperature range for White Horehound is 65-75°F (18-24°C).
It is hardy in USDA zones 5-9, tolerating light frost but not extreme heat. Protect it from temperatures below 20°F (-6°C) during winter.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10, applying every 4-6 weeks during the growing season.
Reduce or stop fertilizing in the fall and winter. Signs of nutrient deficiency include yellowing leaves and stunted growth.
Pruning
Prune White Horehound in early spring to promote bushier growth and remove any dead or damaged stems.
Use clean, sharp pruning shears to make cuts just above a leaf node. Deadheading spent flowers can encourage further blooming.
Repotting
Repot White Horehound every 1-2 years or when it becomes root-bound.
Choose a pot that is 1-2 inches larger in diameter. Signs it needs repotting include roots growing out of the drainage holes and stunted growth. To repot, gently remove the plant from its pot, loosen any tightly bound roots, and place it in fresh soil.
Propagation
White Horehound can be propagated through stem cuttings or seeds.
For stem cuttings, take 4-6 inch cuttings from healthy stems, remove lower leaves, and place them in water or moist soil. Roots will develop in 2-4 weeks. For seeds, sow them in spring after the last frost, covering lightly with soil.
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 frequency. Fertilize with a balanced fertilizer if nutrient deficiency is suspected.
Wilting leaves
Why it happens
Wilting may indicate under-watering or root rot.
How to fix it
Assess soil moisture and water accordingly. If root rot is suspected, remove the plant from the pot, trim away affected roots, and repot in fresh soil.
Browning leaf tips
Why it happens
This is often a sign of low humidity or over-fertilization.
How to fix it
Increase humidity levels by misting or using a humidifier, and reduce fertilizer application.
Pest infestations (aphids, spider mites)
Why it happens
Pests are attracted to stressed plants or poor air circulation.
How to fix it
Regularly inspect the plant, and if pests are found, treat with insecticidal soap or neem oil.
Leggy growth
Why it happens
Insufficient light can cause the plant to stretch toward the light source.
How to fix it
Move the plant to a brighter location where it receives full sun for at least 6 hours a day.
Care through the year
Spring
In spring, prune back any dead or damaged stems and begin regular watering as the plant resumes active growth. Fertilize every 4-6 weeks.
Summer
During summer, ensure the plant receives full sun and water regularly, especially in hot weather. Monitor for pests and increase humidity if needed.
Fall
In fall, reduce watering frequency as the plant's growth slows. Prepare for winter by cutting back on fertilizer and checking for pests.
Winter
In winter, protect the plant from frost and avoid over-watering. If grown indoors, ensure it receives adequate light and humidity.
Toxicity & Safety
White Horehound is generally considered non-toxic to pets and children. However, ingestion in large quantities may cause mild gastrointestinal upset. Always consult a veterinarian if ingestion occurs.
Good to know
How often should I water my White Horehound?
Water your White Horehound 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 White Horehound?
White Horehound thrives in well-draining soil with a pH of 6.0 to 7.0. A sandy or loamy potting mix is ideal for optimal growth.
Can I grow White Horehound indoors?
Yes, White Horehound can be grown indoors as long as it receives sufficient sunlight, ideally 6-8 hours of direct light each day.
Why are my White Horehound leaves turning yellow?
Yellowing leaves can indicate over-watering or a nutrient deficiency. Check soil moisture and consider fertilizing if necessary.
How do I propagate White Horehound?
You can propagate White Horehound through stem cuttings or seeds. For cuttings, take healthy stems, place them in water or moist soil, and wait for roots to develop.
What pests affect White Horehound?
Common pests include aphids and spider mites. Regularly inspect your plant and treat infestations with insecticidal soap or neem oil.
What is the ideal temperature for White Horehound?
White Horehound prefers temperatures between 65-75°F (18-24°C) and is hardy in USDA zones 5-9, tolerating light frost.
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