Mashua
Tropaeolum Tuberosum
Tropaeolum tuberosum, commonly known as Mashua or Tuberous Nasturtium, is a unique perennial plant native to the Andes. Valued for its edible tubers and vibrant flowers, it thrives in well-draining soil and moderate humidity, making it a delightful addition to any garden.
Everything it needs
9 essentials at a glance
Watering
Tropaeolum tuberosum prefers consistently moist soil but should not be waterlogged.
Water 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 the soil dries out quickly. 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 to partial shade, ideally receiving 6-8 hours of sunlight daily.
It can tolerate some shade, especially in hotter climates, but too much shade may hinder flowering. For optimal growth, place it in a location that gets morning sun and afternoon shade.
Soil
Tropaeolum tuberosum prefers well-draining, loamy soil with a pH range of 6.0 to 7.0.
A potting mix that includes compost and perlite or sand is recommended to enhance drainage. Ensure that the pot has drainage holes to prevent water accumulation.
Humidity
This plant enjoys moderate humidity levels, ideally around 40-60%.
To increase humidity, mist the leaves regularly or place a humidity tray filled with water near the plant. Signs of low humidity stress include browning leaf edges and stunted growth.
Temperature
The ideal temperature range for Tropaeolum tuberosum is between 60-75°F (15-24°C).
It is hardy in USDA zones 9-11 and can tolerate light frost but should be protected from extreme heat. In colder months, ensure temperatures do not drop below 50°F (10°C) to prevent damage.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 every 4-6 weeks during the growing season.
Reduce feeding in fall and winter when the plant is dormant. Signs of nutrient deficiency include yellowing leaves, poor growth, and reduced flowering.
Pruning
Prune Tropaeolum tuberosum in early spring before new growth begins.
Remove any dead or damaged stems to encourage healthy growth. Use clean, sharp pruning shears to avoid damaging the plant. Deadheading spent flowers can promote further blooming throughout the season.
Repotting
Repot every 2-3 years or when the plant becomes root-bound, indicated by roots growing out of the drainage holes.
Choose a pot that is 1-2 inches larger in diameter. To repot, gently remove the plant from its current pot, loosen any tightly bound roots, and place it in fresh potting mix, ensuring the tuber is just below the soil surface.
Propagation
Propagation can be done through tuber division or seeds.
For tuber division, carefully separate the tubers in early spring and replant them in well-draining soil. For seed propagation, plant seeds in spring after the last frost, about 1 inch deep in moist soil. Keep the soil warm and consistently moist until germination occurs, usually within 2-3 weeks.
When it's unhappy
Yellow leaves
Why it happens
Usually caused by over-watering or nutrient deficiency.
How to fix it
Check soil moisture levels and adjust watering schedule. Fertilize with a balanced fertilizer if nutrient deficiency is suspected.
Wilting leaves
Why it happens
Typically a result of under-watering or extreme heat.
How to fix it
Increase watering frequency and ensure the plant is not exposed to excessive heat.
Root rot
Why it happens
Caused by overly wet soil and poor drainage.
How to fix it
Remove the plant from the pot, trim away any rotten roots, and repot in fresh, well-draining soil.
Pest infestations (aphids, spider mites)
Why it happens
Common in dry conditions or when plants are stressed.
How to fix it
Regularly inspect the plant, and treat infestations with insecticidal soap or neem oil.
Poor flowering
Why it happens
Can be due to insufficient light or nutrient deficiency.
How to fix it
Ensure the plant receives adequate sunlight and fertilize regularly to promote blooming.
Care through the year
Spring
In spring, begin watering regularly as the plant comes out of dormancy. Fertilize with a balanced fertilizer to promote growth and flowering.
Summer
During summer, ensure consistent moisture and provide some afternoon shade in extremely hot weather. Monitor for pests and diseases.
Fall
In fall, reduce watering as the plant prepares for dormancy. Continue fertilizing until late fall to support tuber development.
Winter
In winter, keep the plant in a cool, dry place and reduce watering significantly. Protect from frost and avoid over-watering.
Toxicity & Safety
Tropaeolum tuberosum is generally considered non-toxic to pets and children. However, ingestion of large quantities may cause mild gastrointestinal upset. The leaves and flowers are edible and safe to consume.
Good to know
How often should I water my Tropaeolum tuberosum?
Water your Tropaeolum tuberosum 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 Mashua?
Mashua thrives in well-draining, loamy soil with a pH of 6.0 to 7.0. A mix of compost and perlite is ideal for promoting drainage.
Why are my Mashua leaves turning yellow?
Yellow leaves can indicate over-watering or a nutrient deficiency. Check the soil moisture and consider fertilizing if needed.
Can I grow Tropaeolum tuberosum indoors?
Yes, you can grow Tropaeolum tuberosum indoors as long as it receives adequate sunlight, ideally 6-8 hours a day, and is kept in a warm environment.
What pests affect Tropaeolum tuberosum?
Common pests include aphids and spider mites. Regularly inspect your plant and treat infestations with insecticidal soap or neem oil.
How do I propagate Mashua?
You can propagate Mashua by dividing tubers in early spring or by planting seeds. Ensure the tubers are healthy and replant them in well-draining soil.
What is the ideal temperature for growing Tropaeolum tuberosum?
The ideal temperature range is between 60-75°F (15-24°C). Protect the plant from temperatures below 50°F (10°C) to avoid damage.
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