Ashitaba
Angelica Keiskei
Ashitaba, or Angelica Keiskei, is a unique herb known for its medicinal properties and vibrant green leaves. Originating from Japan, it is cherished for its health benefits and ease of growth, making it a popular choice among herb enthusiasts.
Everything it needs
9 essentials at a glance
Watering
Ashitaba prefers consistently moist soil but should never be waterlogged.
Water deeply once a week during the growing season, reducing to every two weeks in winter. Signs of over-watering include yellowing leaves and root rot, while under-watering can cause wilting and browning leaf edges.
Light
Ashitaba thrives in partial shade to full sun, ideally receiving 4-6 hours of direct sunlight daily.
It can tolerate some shade, especially in hotter climates, but too much shade may hinder its growth and flavor.
Soil
A well-draining, loamy soil with a pH of 6.0 to 7.0 is ideal for Ashitaba.
A recommended potting mix includes equal parts of compost, peat moss, and perlite to ensure good drainage and nutrient retention.
Humidity
Ashitaba prefers moderate humidity levels around 40-60%.
To increase humidity, mist the leaves regularly or place a humidifier nearby. Signs of low humidity include browning leaf tips and edges.
Temperature
The ideal temperature range for Ashitaba is between 60-75°F (15-24°C).
It is hardy in zones 8-10 and can tolerate light frost but should be protected from extreme heat and cold.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 every 4-6 weeks during the growing season.
Reduce feeding in winter. Signs of nutrient deficiency include yellowing leaves and stunted growth.
Pruning
Prune Ashitaba in early spring to encourage bushier growth.
Use clean, sharp scissors to remove dead or damaged leaves. Regularly deadhead flowers to promote further leaf growth.
Repotting
Repot Ashitaba every 1-2 years or when it outgrows its pot, typically when roots are visible at the drainage holes.
Choose a pot 1-2 inches larger in diameter. Carefully remove the plant, loosen the roots, and place it in fresh potting mix.
Propagation
Ashitaba can be propagated through seeds or division.
For seeds, sow them in spring after the last frost, covering lightly with soil. For division, carefully separate the roots in early spring and replant them in new pots. Ensure they are kept moist until established.
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 adjust watering frequency. Fertilize with a balanced fertilizer if nutrient deficiency is suspected.
Wilting leaves
Why it happens
Wilting can occur due to under-watering or extreme heat.
How to fix it
Increase watering frequency and ensure the plant is not exposed to direct sunlight during the hottest part of the day.
Browning leaf edges
Why it happens
This is often a sign of low humidity or inconsistent watering.
How to fix it
Increase humidity levels through misting or using a humidifier, and maintain consistent watering practices.
Root rot
Why it happens
Root rot is caused by over-watering and poor drainage.
How to fix it
Ensure the pot has adequate drainage holes, reduce watering, and consider repotting into fresh, dry soil.
Pest infestations
Why it happens
Common pests include aphids and spider mites, often due to dry conditions.
How to fix it
Inspect the plant regularly, and treat infestations with insecticidal soap or neem oil.
Care through the year
Spring
In spring, prune back any dead leaves and begin regular watering and fertilizing as the plant comes out of dormancy.
Summer
During summer, ensure Ashitaba receives adequate water and consider providing some afternoon shade to prevent leaf scorch.
Fall
In fall, reduce watering as the plant prepares for dormancy, and continue to monitor for pests as they may become more active.
Winter
In winter, keep the plant in a cool location and reduce watering to every two weeks. Protect it from frost if grown outdoors.
Toxicity & Safety
Ashitaba is generally considered non-toxic to pets and children. However, excessive consumption may lead to gastrointestinal upset. Always consult a healthcare provider for concerns.
Good to know
How often should I water my Ashitaba?
Water your Ashitaba once a week during the growing season, allowing the top inch of soil to dry out between waterings. In winter, reduce watering to every two weeks.
What light conditions are best for Ashitaba?
Ashitaba thrives in partial shade to full sun, needing about 4-6 hours of direct sunlight daily. Too much shade can hinder its growth.
Can I grow Ashitaba indoors?
Yes, Ashitaba can be grown indoors as long as it receives sufficient light, ideally from a south-facing window or under grow lights.
What is the ideal temperature for growing Ashitaba?
Ashitaba prefers temperatures between 60-75°F (15-24°C) and can tolerate light frost, but extreme heat should be avoided.
How do I propagate Ashitaba?
You can propagate Ashitaba through seeds or division. Sow seeds in spring or divide established plants in early spring for new growth.
What type of fertilizer is best for Ashitaba?
A balanced fertilizer with an NPK ratio of 10-10-10 is ideal. Fertilize every 4-6 weeks during the growing season for optimal growth.
Why are my Ashitaba leaves turning yellow?
Yellow leaves can indicate over-watering or nutrient deficiency. Check soil moisture and adjust watering, and consider fertilizing if needed.
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