Liquorice
Glycyrrhiza Uralensis
Glycyrrhiza uralensis, commonly known as Liquorice, is a perennial herb valued for its sweet-tasting roots used in herbal medicine and confectionery. Native to Asia and Europe, this plant is cherished for its unique flavor and potential health benefits, making it a popular choice among gardeners and herbalists alike.
Everything it needs
9 essentials at a glance
Watering
Glycyrrhiza uralensis prefers consistently moist soil, especially during its active growing season in spring and summer.
Water deeply once a week, allowing the top inch of soil to dry out between waterings. In the fall and winter, reduce watering to every 10-14 days. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause wilting and leaf drop.
Light
This plant thrives in full sun, requiring at least 6-8 hours of direct sunlight daily.
Ideal placement is in a south-facing garden bed or a sunny windowsill. It can tolerate partial shade but may result in slower growth and reduced flavor in the roots.
Soil
Glycyrrhiza uralensis prefers well-draining, loamy soil with a pH range of 6.0 to 7.5.
A mix of potting soil, sand, and compost is recommended to ensure good drainage and nutrient availability. Avoid heavy clay soils that retain water.
Humidity
While Glycyrrhiza uralensis is not particularly humidity-sensitive, it benefits from moderate humidity levels of 40-60%.
To increase humidity, consider misting the plant or placing a humidity tray nearby. Signs of low humidity stress include browning leaf edges and stunted growth.
Temperature
The ideal temperature range for Glycyrrhiza uralensis is between 65°F to 75°F (18°C to 24°C).
It can tolerate temperatures as low as 20°F (-6°C) and is hardy in USDA zones 5-9. Protect the plant from extreme heat by providing shade during the hottest part of the day.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 during the growing season, applying every 4-6 weeks.
In the fall, switch to a low-nitrogen fertilizer to prepare the plant for dormancy. Signs of nutrient deficiency include yellowing leaves and poor growth.
Pruning
Prune Glycyrrhiza uralensis in late winter or early spring before new growth begins.
Use sharp, clean pruning shears to remove any dead or damaged stems. This plant does not require heavy pruning, but shaping can be done to maintain its form.
Repotting
Repot Glycyrrhiza uralensis every 2-3 years or when you notice roots growing out of the drainage holes.
Choose a pot that is 1-2 inches larger in diameter. Signs it needs repotting include stunted growth and water not absorbing properly. When repotting, gently loosen the root ball and place it in fresh soil.
Propagation
Glycyrrhiza uralensis can be propagated through seeds or root cuttings.
For seeds, soak them in water for 24 hours before planting in spring. For root cuttings, take sections of healthy roots in early spring, ensuring each piece has at least one bud. Plant the cuttings in moist soil and keep them shaded until new growth appears.
When it's unhappy
Yellow leaves
Why it happens
Often 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.
Root rot
Why it happens
Occurs due to poor drainage and over-watering.
How to fix it
Ensure proper drainage in the pot and reduce watering. If root rot is severe, consider repotting with fresh soil and removing affected roots.
Wilting
Why it happens
Typically a sign of under-watering or extreme heat.
How to fix it
Increase watering frequency and provide shade during peak sun hours.
Browning leaf edges
Why it happens
Can indicate low humidity or nutrient deficiency.
How to fix it
Increase humidity levels through misting or a humidity tray, and ensure proper fertilization.
Stunted growth
Why it happens
May result from poor soil conditions or lack of sunlight.
How to fix it
Ensure the plant is in well-draining soil and receives adequate sunlight.
Care through the year
Spring
In spring, resume regular watering and fertilizing as the plant begins to grow. Monitor for pests and ensure adequate sunlight.
Summer
During summer, keep the soil consistently moist and provide shade during extreme heat. Fertilize every 4-6 weeks to support growth.
Fall
In fall, reduce watering as the plant prepares for dormancy. Harvest roots at the end of the season for optimal flavor.
Winter
In winter, water less frequently, allowing the soil to dry out more between waterings. Protect the plant from frost if grown outdoors.
Toxicity & Safety
Glycyrrhiza uralensis is generally considered non-toxic to pets and children. However, excessive consumption of the roots can lead to health issues such as hypertension and potassium depletion. Symptoms of ingestion include headaches and digestive upset.
Good to know
How often should I water my Glycyrrhiza uralensis?
Water your Glycyrrhiza uralensis once a week during the growing season, allowing the top inch of soil to dry out between waterings. In winter, reduce watering to every 10-14 days.
What type of soil is best for Liquorice plants?
Glycyrrhiza uralensis thrives in well-draining loamy soil with a pH of 6.0 to 7.5. A mix of potting soil, sand, and compost is ideal.
Why are my Liquorice plant leaves turning yellow?
Yellow leaves can indicate over-watering or a nutrient deficiency. Check the soil moisture and adjust your watering schedule, and consider fertilizing if needed.
Can I grow Glycyrrhiza uralensis indoors?
Yes, Glycyrrhiza uralensis can be grown indoors if provided with sufficient sunlight, ideally 6-8 hours of direct light daily, and proper watering.
When is the best time to harvest Liquorice roots?
The best time to harvest Glycyrrhiza uralensis roots is in the fall, after the plant has matured for at least 3 years, ensuring the roots are rich in flavor.
How do I propagate Glycyrrhiza uralensis?
You can propagate Glycyrrhiza uralensis through seeds or root cuttings. Soak seeds for 24 hours before planting or take root cuttings in early spring.
What are the common pests affecting Liquorice plants?
Common pests include aphids and spider mites. Regularly inspect your plant and treat infestations with insecticidal soap or neem oil.
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