Greater Masterwort
Astrantia major · Great MasterwortUSDA | Grow Zone
3-8Outdoors all year in zones 3 to 8. Anywhere colder, keep it as a houseplant.
- Light
- Partial shade to full sun
- Water
- Consistently moist soil
- Humidity
- 40-60%
- Temperature
- 60-75°F (15-24°C)
- Difficulty
- Beginner
- Growth
- Moderate
- Mature size
- 2-3 ft tall, 1-2 ft wide
- Pets
- Non-toxic to pets and children
Astrantia major, commonly known as Greater Masterwort, is a stunning perennial native to Europe. With its unique flower heads and ability to thrive in partial shade, it adds beauty to any garden. This plant is cherished for its resilience and attractive foliage.
Ask Vesper about Greater Masterwort
Ideal temperature
60-75°F is where it grows fastest.
Spacing and harvest
- Mature size
- 2-3 ft tall, 1-2 ft wide
- Plant apart
- 12-24 in
- Frost
- Hardy: survives frost
Everything it needs
9 essentials at a glance
Watering
Astrantia major prefers consistently moist soil but should not be waterlogged.
Water deeply once a week during the growing season, allowing the top inch of soil to dry out between waterings. In hotter months, increase frequency to twice a week if needed. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause wilting and browning leaf edges.
Light
This plant thrives in partial shade to full sun, ideally receiving 4-6 hours of direct sunlight daily.
In hotter climates, some afternoon shade is beneficial to prevent leaf scorch. It tolerates a range of light conditions but will produce more flowers in brighter locations.
Soil
Astrantia major prefers well-draining, fertile soil with a pH range of 6.0 to 7.0.
A mix of loamy soil with organic matter, such as compost, is ideal. Ensure good drainage to prevent waterlogging, which can lead to root rot.
Humidity
This plant enjoys moderate humidity levels, around 40-60%.
To increase humidity, mist the leaves regularly or place a humidifier nearby. Signs of low humidity stress include browning leaf tips and wilting.
Temperature
Ideal temperature range for Astrantia major is 60-75°F (15-24°C).
It is hardy in USDA zones 3-8, tolerating cold temperatures down to -30°F (-34°C). Protect from extreme heat, as prolonged high temperatures can stress the plant.
Fertilizing
Use a balanced, slow-release fertilizer with an NPK ratio of 10-10-10, applied in early spring.
Fertilize every 6-8 weeks during the growing season. Signs of nutrient deficiency include pale leaves and reduced flowering.
Pruning
Prune back spent flowers to encourage a second bloom and maintain a tidy appearance.
Use clean, sharp pruning shears. Remove any dead or damaged foliage in early spring to promote new growth.
Repotting
Repot Astrantia major every 2-3 years or when it outgrows its pot.
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. Carefully remove the plant, refresh the soil, and replant.
Propagation
Astrantia major can be propagated by division or seeds.
For division, dig up the plant in early spring or fall, and separate the root clumps, ensuring each division has roots and shoots. Replant immediately. For seeds, sow in late winter or early spring, covering lightly with soil. Keep moist until germination.
When it's unhappy
Yellow leaves
Why it happens
This can be caused by over-watering or nutrient deficiency.
How to fix it
Check soil moisture levels and reduce watering frequency if necessary. Fertilize if nutrient deficiency is suspected.
Wilting
Why it happens
Wilting may result from under-watering or extreme heat.
How to fix it
Ensure consistent moisture and provide shade during the hottest part of the day.
Root rot
Why it happens
Root rot is typically caused by overly wet soil and poor drainage.
How to fix it
Improve drainage by amending the soil and reduce watering frequency. Remove affected roots and replant in fresh soil.
Powdery mildew
Why it happens
This fungal disease often occurs in humid conditions with poor air circulation.
How to fix it
Increase air circulation around the plant and apply a fungicide if necessary.
Pest infestations (aphids, spider mites)
Why it happens
Pests may be attracted to stressed plants or those with low humidity.
How to fix it
Regularly inspect the plant and treat infestations with insecticidal soap or neem oil.
Care through the year
Spring
In spring, prune back any dead foliage and prepare the soil with compost. This is also the best time to propagate by division.
Summer
During summer, ensure consistent moisture and provide some afternoon shade in hotter climates. Fertilize every 6-8 weeks.
Fall
In fall, cut back spent flowers and prepare the plant for winter by mulching around the base to protect the roots.
Winter
In winter, protect the plant from extreme cold by covering with mulch. Avoid excessive watering during dormancy.
Toxicity & Safety
Astrantia major is considered non-toxic to pets and children. However, ingestion of large quantities may cause mild stomach upset. Always consult a veterinarian if ingestion occurs.
Good to know
How often should I water my Astrantia major?
Water your Astrantia major once a week, allowing the top inch of soil to dry out. In hotter months, you may need to increase watering to twice a week.
What light conditions are best for Greater Masterwort?
Astrantia major thrives in partial shade to full sun, ideally receiving 4-6 hours of sunlight daily. In hotter climates, some afternoon shade is beneficial.
When is the best time to prune Astrantia major?
Prune back spent flowers in late summer to encourage a second bloom and remove any dead foliage in early spring to promote new growth.
Can I grow Astrantia major in containers?
Yes, Astrantia major can be grown in containers. Ensure the pot has good drainage and use a well-draining potting mix to prevent root rot.
What is the ideal soil type for Greater Masterwort?
Astrantia major prefers well-draining, fertile soil with a pH range of 6.0 to 7.0. A mix of loamy soil and organic matter works best.
How do I propagate Astrantia major?
You can propagate Astrantia major by division or seeds. For division, separate the root clumps in early spring or fall. For seeds, sow them in late winter or early spring.
What are the signs of nutrient deficiency in Astrantia major?
Signs of nutrient deficiency include pale leaves and reduced flowering. Regular fertilization can help prevent these issues.
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