Cultivated Licorice
Glycyrrhiza glabra
Glycyrrhiza glabra, commonly known as cultivated licorice, is valued for its sweet root used in candies and herbal remedies. This perennial herb thrives in sunny locations and well-draining soil, making it a popular choice for both gardens and containers.
Everything it needs
9 essentials at a glance
Watering
Glycyrrhiza glabra prefers consistently moist soil but should not be waterlogged.
Water deeply once a week, allowing the top inch of soil to dry out between waterings. In hotter months, increase frequency to twice a week. 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 container. It can tolerate partial shade, but growth may be slower and less vigorous in lower light conditions.
Soil
Glycyrrhiza glabra prefers well-draining, sandy loam with a pH range of 6.0 to 8.0.
A potting mix that includes perlite or sand to improve drainage is recommended. Ensure the pot has drainage holes to prevent water accumulation.
Humidity
This plant prefers moderate humidity levels around 40-60%.
To increase humidity, mist the leaves regularly or place a humidity tray filled with water near the plant. Signs of humidity stress include browning leaf tips and leaf drop.
Temperature
Glycyrrhiza glabra thrives in temperatures between 70-85°F (21-29°C) and is hardy in USDA zones 7-10.
It can tolerate brief periods of cold down to 20°F (-6°C) but should be protected from frost. In winter, ensure it is kept in a sheltered location.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 or similar.
Fertilize every 4-6 weeks during the growing season, from spring to early fall. Signs of nutrient deficiency include yellowing leaves and stunted growth.
Pruning
Prune Glycyrrhiza glabra in late winter or early spring before new growth begins.
Use sharp, clean pruning shears to remove dead or damaged stems. Light shaping can be done to encourage bushier growth, but avoid heavy pruning as it can stress the plant.
Repotting
Repot Glycyrrhiza glabra every 2-3 years or when roots outgrow the pot.
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 gently loosen the roots during the transfer.
Propagation
Propagation can be done through seed or root division.
For seeds, soak them in water for 24 hours before planting in spring. Plant seeds 1 inch deep in well-draining soil. For root division, carefully dig up established plants in early spring, ensuring each division has roots and at least one shoot. Replant immediately.
When it's unhappy
Yellow leaves
Why it happens
Often caused by over-watering or nutrient deficiency.
How to fix it
Check soil moisture levels and adjust watering schedule. Fertilize 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 and reduce watering frequency. Remove affected roots and repot in fresh, dry soil.
Wilting
Why it happens
Can be caused by under-watering or extreme heat.
How to fix it
Increase watering frequency and ensure the plant is not exposed to excessive heat without adequate moisture.
Browning leaf tips
Why it happens
Typically a sign of low humidity or over-fertilization.
How to fix it
Increase humidity around the plant and reduce fertilizer application.
Pest infestations (aphids, spider mites)
Why it happens
Commonly attracted to stressed plants.
How to fix it
Inspect regularly and treat with insecticidal soap or neem oil if pests are found.
Care through the year
Spring
In spring, focus on fertilizing and watering as new growth emerges. Prune any dead or damaged stems to encourage bushier growth.
Summer
During summer, ensure consistent watering, especially in hot weather. Monitor for pests and increase humidity if necessary.
Fall
In fall, reduce watering as temperatures drop and prepare the plant for winter. Consider mulching around the base to protect roots.
Winter
In winter, protect Glycyrrhiza glabra from frost by moving pots indoors or covering outdoor plants. Water sparingly, allowing the soil to dry out between waterings.
Toxicity & Safety
Glycyrrhiza glabra is considered non-toxic to pets and children. However, excessive consumption of licorice root can lead to health issues such as hypertension and potassium deficiency. Always consult a healthcare professional before using it medicinally.
Good to know
How often should I water my Glycyrrhiza glabra?
Water your Glycyrrhiza glabra deeply once a week, allowing the top inch of soil to dry out. In hotter months, you may need to water twice a week.
What type of soil is best for Licorice plants?
Glycyrrhiza glabra prefers well-draining sandy loam with a pH of 6.0 to 8.0. A mix that includes perlite or sand is ideal for drainage.
Can Glycyrrhiza glabra grow in shade?
While it can tolerate partial shade, Glycyrrhiza glabra thrives best in full sun with at least 6-8 hours of direct sunlight daily for optimal growth.
What are the signs of nutrient deficiency in Licorice plants?
Signs of nutrient deficiency include yellowing leaves, stunted growth, and poor leaf development. Regular fertilization can help prevent this.
When is the best time to prune Glycyrrhiza glabra?
The best time to prune Glycyrrhiza glabra is in late winter or early spring before new growth begins, allowing for healthier growth in the growing season.
How do I propagate Glycyrrhiza glabra?
You can propagate Glycyrrhiza glabra through seeds or root division. For seeds, soak them for 24 hours before planting. For root division, dig up and separate established plants in early spring.
What temperature range is ideal for Licorice plants?
Glycyrrhiza glabra thrives in temperatures between 70-85°F (21-29°C) and is hardy in USDA zones 7-10, making it suitable for a variety of climates.
Grows well with
Track this plant in your garden.
Set care reminders, log growth, and join a community of plant lovers.