Langsat
Lansium Parasiticum
Lansium parasiticum, commonly known as Langsat, is a tropical fruit tree native to Southeast Asia. Valued for its sweet, juicy fruit, it thrives in warm, humid conditions and makes an excellent addition to home gardens.
Everything it needs
9 essentials at a glance
Watering
Lansium parasiticum prefers consistently moist soil but should not be waterlogged.
Water every 1-2 weeks, allowing the top inch of soil to dry out between waterings. During the growing season (spring and summer), increase frequency if the soil dries out faster. Signs of over-watering include yellowing leaves and root rot, while under-watering may cause leaf drop and wilting.
Light
This plant thrives in full sun to partial shade, ideally receiving 6-8 hours of direct sunlight daily.
It can tolerate some shade but may not produce fruit as abundantly. Ideal placement includes a south-facing window or outdoor area with filtered sunlight during the hottest parts of the day.
Soil
Lansium parasiticum prefers well-draining, loamy soil with a pH range of 5.5 to 7.0.
A recommended potting mix includes equal parts peat moss, perlite, and compost to ensure good drainage and nutrient retention.
Humidity
This plant enjoys high humidity levels of 60% or more.
To increase humidity, consider using a humidifier, placing a tray of water near the plant, or misting the leaves regularly. Signs of humidity stress include browning leaf tips and edges.
Temperature
The ideal temperature range for Lansium parasiticum is between 70-90°F (21-32°C).
It is best suited for USDA hardiness zones 10-12. It can tolerate brief periods of heat but is sensitive to frost, so protect it during cold snaps.
Fertilizing
Use a balanced fertilizer with an NPK ratio of 10-10-10 or 14-14-14 during the growing season.
Fertilize every 4-6 weeks from spring to early fall. Signs of nutrient deficiency include yellowing leaves (nitrogen), poor fruit development (phosphorus), and stunted growth (potassium).
Pruning
Prune Lansium parasiticum in late winter or early spring to shape the plant and remove any dead or diseased branches.
Use sharp, clean pruning shears to make clean cuts. Deadheading is not necessary, but removing spent flowers can encourage better fruit production.
Repotting
Repot Lansium parasiticum every 2-3 years or when it becomes root-bound, indicated by roots growing out of the drainage holes.
Choose a pot that is 1-2 inches larger in diameter. Carefully remove the plant from its pot, loosen the roots, and place it in fresh potting mix.
Propagation
Propagation can be achieved through seeds or air layering.
For seeds, collect ripe fruit, extract seeds, and plant them in a moist seed-starting mix. Keep them warm and humid until germination occurs, which can take several weeks. Air layering involves wounding a branch, applying rooting hormone, and wrapping it in moist sphagnum moss until roots develop.
When it's unhappy
Yellow leaves
Why it happens
Over-watering or nutrient deficiency.
How to fix it
Check soil moisture levels and adjust watering frequency. Fertilize with a balanced fertilizer if nutrient deficiency is suspected.
Leaf drop
Why it happens
Under-watering or sudden temperature changes.
How to fix it
Ensure consistent watering and protect the plant from drafts or sudden temperature fluctuations.
Brown leaf tips
Why it happens
Low humidity levels.
How to fix it
Increase humidity through misting or using a humidifier, and ensure the plant is not placed near heating vents.
Poor fruit production
Why it happens
Insufficient light or nutrient imbalance.
How to fix it
Ensure the plant receives adequate sunlight and fertilize regularly to promote healthy fruit development.
Root rot
Why it happens
Over-watering and poor drainage.
How to fix it
Allow the soil to dry out, improve drainage, and remove any affected roots. Repot if necessary.
Care through the year
Spring
In spring, increase watering as the plant begins to grow actively. Fertilize every 4-6 weeks to support new growth and prepare for fruiting.
Summer
During summer, ensure the plant receives adequate water and light. Monitor humidity levels and adjust watering frequency as needed to prevent stress.
Fall
In fall, gradually reduce watering as the plant enters dormancy. Continue to fertilize until late fall, then stop to allow the plant to rest.
Winter
In winter, protect the plant from cold drafts and extreme temperatures. Water less frequently, allowing the soil to dry out more between waterings.
Toxicity & Safety
Lansium parasiticum is considered non-toxic to pets and children. The fruit is edible, but excessive consumption may cause digestive upset. Always wash fruit before consumption.
Good to know
Why are my Lansium parasiticum leaves turning yellow?
Yellow leaves on Lansium parasiticum can indicate over-watering or a nutrient deficiency. Check the soil moisture and adjust your watering schedule, and consider fertilizing if you suspect a lack of nutrients.
How often should I water my Lansium parasiticum?
Water your Lansium parasiticum every 1-2 weeks, allowing the top inch of soil to dry out between waterings. Adjust frequency based on seasonal changes and environmental conditions.
What light conditions are best for Lansium parasiticum?
Lansium parasiticum thrives in full sun to partial shade, ideally receiving 6-8 hours of direct sunlight daily. Ensure it is placed in a bright location for optimal growth and fruit production.
How can I increase humidity for my Lansium parasiticum?
To increase humidity, mist the leaves regularly, use a humidifier, or place a tray of water near the plant. Aim for humidity levels of 60% or higher for best results.
When is the best time to prune my Lansium parasiticum?
The best time to prune Lansium parasiticum is in late winter or early spring before new growth begins. This helps shape the plant and remove any dead or diseased branches.
What is the ideal temperature for Lansium parasiticum?
Lansium parasiticum prefers temperatures between 70-90°F (21-32°C). Protect it from frost and extreme temperature fluctuations to ensure healthy growth.
How do I propagate Lansium parasiticum?
You can propagate Lansium parasiticum through seeds or air layering. For seeds, extract from ripe fruit and plant in a moist mix. For air layering, wound a branch and wrap it in moist moss until roots develop.
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