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How to Grow Langsat

Lansium parasiticum

Perennial

Langsat is a strictly tropical tree that must be grown in a heated greenhouse or large conservatory in the UK, with a minimum temperature of 15°C year-round. Provide bright indirect light or dappled shade rather than harsh direct sun. Keep compost consistently moist and mist regularly for humidity. It is slow to establish and may take many years to fruit, but makes an attractive foliage plant in the meantime.

Yearly Lifecycle

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JanFebMarAprMayJunJulAugSepOctNovDec
Flowering Fruit Set Harvest

Care Essentials

Feed monthly with a balanced liquid fertiliser during the growing season. Langsat is slow-growing and benefits from steady, moderate nutrition — avoid over-feeding which can cause leaf scorch.

Watch For

  • Scale insects
  • Mealybug
  • Red spider mite
  • Root rot from overwatering
  • Sooty mould

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Care Requirements

☀️ Light

Bright indirect light, dappled shade preferred

Bright indirect light or dappled shade. Langsat naturally grows as an understorey tree and prefers filtered light rather than harsh direct sun.

💧 Watering

Consistently moist, mist regularly for humidity

Keep compost consistently moist throughout the year. Langsat does not tolerate drought. Use rainwater where possible and mist regularly to maintain humidity.

🌱 Fertilizing

Monthly balanced feed during growing season

Feed monthly with a balanced liquid fertiliser during the growing season. Langsat is slow to establish and benefits from steady, moderate feeding.

✂️ Pruning

Minimal pruning, remove dead branches only

Minimal pruning needed. Remove dead or damaged branches. Langsat is slow-growing and naturally forms a tidy shape.

❄️ Overwintering

Heated glass essential, minimum 15°C year-round

Requires a heated greenhouse or conservatory with a minimum temperature of 15°C. Langsat is strictly tropical and cannot tolerate any cold.

Growing Tips

Filtered light preferred

Langsat naturally grows as an understorey tree. Provide bright indirect light or dappled shade rather than harsh direct sun through glass.

Consistent moisture essential

Keep compost consistently moist at all times and mist foliage regularly. Langsat does not tolerate drought and needs high humidity.

Monitor for sap-sucking pests

Watch for scale insects and mealybug under glass. Wipe off with soapy water or introduce biological controls early before populations build up.

Steady moderate feeding

Feed monthly with a balanced liquid fertiliser during the growing season. Langsat is slow-growing and benefits from steady, moderate feeding.

Pests & Diseases

Pest Scale Insects

Identification: Small brown or white bumps on stems and leaf undersides, sticky honeydew and sooty mould

Organic treatment:
  • Wipe off with a cloth dipped in soapy water
  • Introduce parasitic wasps as biological control under glass
Chemical treatment:
  • Spray with plant oil-based insecticide
Pest Mealybug

Identification: White cottony masses in leaf axils and on stems, sticky honeydew

Organic treatment:
  • Dab with a cotton bud soaked in methylated spirit
  • Introduce Cryptolaemus ladybird as biological control
Chemical treatment:
  • Spray with fatty acid or plant oil-based insecticide
Pest Red Spider Mite

Identification: Fine webbing on leaf undersides, stippled yellowing leaves, tiny mites visible with a hand lens

Organic treatment:
  • Increase humidity by misting regularly
  • Introduce predatory mite Phytoseiulus persimilis
Chemical treatment:
  • Spray with fatty acid-based miticide
Disease Root Rot Phytophthora spp.

Symptoms: Yellowing leaves, wilting despite moist soil, dark mushy roots, plant collapse

Treatment: Remove from pot, trim rotten roots, repot in fresh free-draining compost. Reduce watering

Prevention: Use well-drained compost. Ensure pots have adequate drainage holes

Disease Sooty Mould

Symptoms: Black powdery coating on leaves and stems, growing on honeydew from sap-sucking insects

Treatment: Wipe off with a damp cloth. Control the underlying pest problem

Prevention: Monitor for and control sap-sucking pests promptly

Spacing & Planting

Plant spacing 900 cm
Row spacing 1000 cm
Mature height 600 cm
Mature spread 400 cm

Also called lansones or lanzones. Evergreen tropical tree. Erratic flowering in Hawaii. Slow to establish.

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