Rue
Ruta Graveolens
Rue, known botanically as Ruta graveolens, is a hardy herb valued for its aromatic leaves and medicinal properties. Originating from the Mediterranean, it is often grown in gardens for its culinary uses and pest-repelling qualities.
Everything it needs
9 essentials at a glance
Watering
Rue prefers to be kept on the drier side, so water only when the top inch of soil feels dry.
In the growing season (spring and summer), water approximately every 1-2 weeks, allowing the soil to dry out between waterings. In fall and winter, reduce watering to once every 2-3 weeks. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause leaf drop and wilting.
Light
Rue 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 become leggy and less productive in such conditions.
Soil
Rue prefers well-draining soil with a pH range of 6.0 to 7.0.
A mix of potting soil, sand, and perlite works well to ensure good drainage. Avoid heavy clay soils that retain moisture, as this can lead to root rot.
Humidity
Rue prefers low to moderate humidity levels, ideally around 40-60%.
To increase humidity, you can mist the leaves occasionally or place a humidity tray with water near the plant. Signs of humidity stress include browning leaf tips and curling leaves.
Temperature
Rue thrives in temperatures between 60-75°F (15-24°C) and is hardy in zones 4-9.
It can tolerate brief periods of cold but should be protected from frost. In hotter climates, provide some afternoon shade to prevent heat stress.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 or similar.
Fertilize every 4-6 weeks during the growing season, reducing to once every 2-3 months in fall and winter. Signs of nutrient deficiency include yellowing leaves and stunted growth.
Pruning
Prune rue in early spring to encourage bushier growth and remove any dead or damaged stems.
Use sharp, clean scissors or pruning shears. Deadheading spent flowers can promote further blooming and prevent self-seeding.
Repotting
Repot rue every 2-3 years or when it becomes root-bound.
Choose a pot that is 1-2 inches larger in diameter than the current one. Signs it needs repotting include roots growing out of the drainage holes and stunted growth. When repotting, gently loosen the roots and place the plant in fresh soil.
Propagation
Rue can be propagated through stem cuttings or seeds.
For stem cuttings, take a 4-6 inch cutting from a healthy plant, remove the lower leaves, and place it in water or moist soil until roots develop, typically within 2-4 weeks. For seeds, sow them in spring after the last frost, covering lightly with soil and keeping them moist until germination.
When it's unhappy
Yellow leaves
Why it happens
Typically caused by over-watering or nutrient deficiency.
How to fix it
Check the soil moisture and reduce watering frequency. Fertilize if nutrient deficiency is suspected.
Wilting leaves
Why it happens
Often a sign of under-watering or root rot.
How to fix it
Ensure consistent watering, allowing the soil to dry out slightly between waterings. 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
Can result from low humidity or excessive heat.
How to fix it
Increase humidity by misting or using a humidity tray, and provide some afternoon shade in hot weather.
Leggy growth
Why it happens
Occurs when the plant does not receive enough light.
How to fix it
Move the plant to a brighter location where it can receive full sun for at least 6 hours daily.
Pests (aphids, spider mites)
Why it happens
Common pests that can infest rue, especially in dry conditions.
How to fix it
Inspect regularly and treat infestations with insecticidal soap or neem oil, ensuring to cover both sides of the leaves.
Care through the year
Spring
In spring, prune rue to encourage new growth and fertilize with a balanced fertilizer to promote healthy development.
Summer
During summer, ensure the plant receives full sun and water regularly, allowing the soil to dry out slightly between waterings.
Fall
In fall, reduce watering frequency and prepare the plant for cooler temperatures. Consider bringing potted rue indoors if frost is expected.
Winter
In winter, limit watering to once every 2-3 weeks and keep the plant in a cool, bright location to prevent dormancy issues.
Toxicity & Safety
Rue is toxic to pets (cats and dogs) and children. The leaves and stems contain compounds that can cause gastrointestinal upset, skin irritation, and photosensitivity if ingested. Symptoms include vomiting, diarrhea, and skin rashes.
Good to know
Why are my rue leaves turning yellow?
Yellow leaves on rue can be a sign of over-watering or nutrient deficiency. Check the soil moisture and adjust your watering schedule accordingly.
How often should I water my rue plant?
Water rue when the top inch of soil feels dry, typically every 1-2 weeks during the growing season and less frequently in fall and winter.
Can rue be grown indoors?
Yes, rue can be grown indoors as long as it receives adequate sunlight, ideally 6-8 hours of direct light each day. A south-facing window is best.
Is rue safe for pets?
No, rue is toxic to pets, including cats and dogs. Ingestion can cause gastrointestinal upset and skin irritation.
How do I propagate rue?
Rue can be propagated through stem cuttings or seeds. For cuttings, take a healthy stem, remove lower leaves, and place it in water or soil until roots develop.
What pests affect rue plants?
Common pests include aphids and spider mites. Regular inspection and treatment with insecticidal soap can help manage these pests.
How do I prune my rue plant?
Prune rue in early spring to encourage bushier growth. Use sharp scissors to remove dead or damaged stems and deadhead spent flowers.
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