From our farm: Mawun Valley Farm is home to 6 mature cashew trees producing both nuts and the rare cashew apple fruit. Visit during harvest season (August-December) to experience cashew firsthand.
The cashew tree (Anacardium occidentale) is one of nature's most fascinating plants — and one of the most misunderstood. Most people have eaten cashew nuts without ever seeing the tree, understanding its strange fruit structure, or knowing that the "nut" they love is actually a seed attached to a fruit most of the world has never tasted.
This guide shares everything we've learned from years of growing cashew at Mawun Valley Farm in South Lombok, Indonesia.
The Basics: What is a Cashew Tree?
Classification
- Scientific name: Anacardium occidentale
- Family: Anacardiaceae (same family as mango, poison ivy, and pistachio)
- Origin: Northeastern Brazil
- Common names: Cashew, caju, cajueiro, jambu monyet (Indonesian)
Physical Characteristics
Size: Medium-sized evergreen tree reaching 10-12 meters in optimal conditions. Some specimens grow larger, but commercial varieties are often kept smaller for easier harvesting.
Canopy: Spreading, dome-shaped crown that can span 12+ meters wide. Provides excellent shade.
Leaves: Simple, leathery, oval-shaped leaves, 10-20cm long. Dark green and glossy.
Bark: Grey-brown, becoming rough and fissured with age.
Root system: Deep taproot with extensive lateral roots — one reason cashew tolerates drought so well.
Lifespan
A healthy cashew tree can live 40-60 years and remain productive for 25-30 years. The trees at our farm are approximately 15-20 years old, in their prime production years.
The Strange Fruit: Understanding Cashew's Unique Structure
Here's what surprises everyone: the cashew "nut" is actually a seed, and it grows attached to a fruit that most of the world ignores.
The Cashew Apple (Pseudofruit)
The colorful, pear-shaped structure is called the cashew apple — technically a "pseudofruit" or "accessory fruit" because it develops from the flower's receptacle rather than the ovary.
Characteristics:
- Color: Yellow, orange, or red when ripe
- Size: 5-11 cm long
- Texture: Soft, fibrous, extremely juicy
- Taste: Sweet, tangy, slightly astringent
The cashew apple is five times higher in Vitamin C than oranges and perfectly edible. The challenge? It ferments within 24 hours of harvest, making commercial export impossible. This is why most people have never tasted it.
Learn more in our guide: What is Cashew Apple?
The True Fruit (The "Nut")
What we call the cashew nut is actually the seed inside the true fruit — a kidney-shaped drupe that hangs below the cashew apple.
Structure:
- Outer shell: Contains urushiol (same irritant as poison ivy) — toxic and must be carefully processed
- Inner shell: Hard protective layer
- Kernel: The edible cashew "nut" we know
Why cashews are expensive: The shell must be carefully roasted and removed without contaminating the edible kernel. This labor-intensive process is why cashews cost more than many other nuts.
Growing Conditions: Where Cashew Thrives
Climate Requirements
Temperature:
- Optimal: 20-30°C (68-86°F)
- Tolerates: 15-40°C
- Frost: Cannot survive any frost
Rainfall:
- Annual: 1,000-2,000mm (40-80 inches)
- Critical: Needs distinct dry season for flowering
- Wet season: Encourages vegetative growth
- Dry season: Triggers flowering and fruiting
Why South Lombok is ideal: Our location at Mawun Valley has exactly this pattern — wet season from November-March, dry season April-October — perfectly matching cashew's natural cycle.
Soil Preferences
Cashew is remarkably tolerant of poor soils:
- Drainage: Essential — waterlogging kills trees
- Texture: Sandy or sandy loam preferred
- pH: 5.5-7.5 (slightly acidic to neutral)
- Fertility: Thrives even in low-fertility soils
- Depth: Deep soils allow full root development
This tolerance is why cashew grows well in marginal land where other crops struggle.
Altitude
- Sea level to 1,000 meters
- Best production below 600 meters
- Higher altitudes reduce yield and extend maturation
The Cashew Lifecycle: From Seed to Harvest
Year 1-2: Establishment
Propagation: Cashew is typically grown from seed (direct planting of selected nuts) or grafted seedlings for commercial varieties.
Young tree care:
- Regular watering during dry periods
- Weed control around the base
- Protection from livestock
- No fruit production expected
Year 3-4: First Flowering
Flowers: Small, pinkish-white flowers in clusters (panicles)
- Each panicle contains 200-1,000 individual flowers
- Only about 5-10% of flowers set fruit (normal)
- Both male and bisexual flowers on the same tree
First harvest: Typically small — 1-3 kg of nuts per tree
Year 5-10: Increasing Production
Growth phase: Trees fill out their canopy and establish deeper root systems.
Production: Gradually increases each year
- Year 5: 5-10 kg/tree
- Year 7: 10-15 kg/tree
- Year 10: 15-25 kg/tree
Year 10-25: Peak Production
Prime years: Mature trees can produce 20-30 kg of nuts annually under good conditions.
Consistency: Production becomes more reliable year-to-year (weather permitting).
Year 25+: Declining Phase
Reduced yields: Production gradually decreases.
Decision point: Farmers must decide whether to maintain older trees or replant with new stock.
Harvest Season: What Happens When
Timing in Indonesia
- Main season: August through December
- Peak: September and October
- Regional variation: Slight differences between islands
Natural Harvest Process
Unlike many fruits, cashew doesn't need to be picked:
- Fruit ripens and changes color
- The entire unit (apple + nut) falls to the ground
- Farmers collect fallen fruit daily
- Quick processing prevents fermentation
This natural drop makes harvesting labor-efficient — no climbing or reaching required.
What We Do at Mawun Valley
During harvest season at the farm:
- Daily collection: We gather fallen fruit each morning
- Separation: Nuts are twisted off from apples
- Apple processing: Used same-day for juice or jam-making
- Nut drying: Sun-dried for several days before storage
Guests staying during season often join the morning collection — it's a meditative, satisfying activity.
Processing: From Tree to Table
The Cashew Apple
The fruit must be used within hours:
- Fresh juice: Pressed and consumed immediately
- Jam: Cooked with sugar to preserve (see our recipe)
- Feni: Fermented into spirit (in Goa, India)
- Animal feed: What remains often feeds livestock
At Noni's Cafe, we use our own cashew apple jam in pastries and serve it with breakfast.
The Cashew Nut
Processing is more complex:
- Drying: Sun-dried for 2-3 days to reduce moisture
- Roasting: Carefully heated to neutralize shell toxins
- Shelling: Manual or mechanical removal of outer shell
- Peeling: Testa (seed coat) removed
- Grading: Sorted by size and quality
- Packaging: Vacuum-sealed or packaged for sale
Why this matters: The shell contains urushiol, which can cause severe skin reactions. Professional processing is essential — don't attempt at home without proper training.
Growing Your Own Cashew Tree
Can You Grow Cashew at Home?
If you live in a tropical or subtropical climate with:
- No frost
- Distinct wet/dry seasons
- Well-draining soil
- Space for a 10+ meter canopy
Then yes, you can grow cashew. Container growing is possible but limits production significantly.
Starting from Seed
- Select fresh nuts — must be truly fresh, not roasted or processed
- Soak overnight in water
- Plant immediately — 3-5cm deep in well-draining soil
- Keep moist until germination (2-4 weeks)
- Transplant when seedlings are 30-50cm tall
Care Tips
- Water regularly during first 2 years
- Mulch to retain moisture and suppress weeds
- Minimal pruning needed (remove dead wood only)
- Fertilize sparingly — cashew prefers lean soils
- Patience — first meaningful harvest takes 5+ years
Cashew and Permaculture
Why Cashew Fits Our Farm
At Mawun Valley Farm, cashew trees are part of an integrated permaculture system:
Multiple yields: Both nuts (protein/fat) and fruit (vitamins/carbohydrates)
Shade provision: The spreading canopy creates micro-climates for shade-loving plants below
Soil building: Leaf litter adds organic matter; deep roots access nutrients other plants can't reach
Drought insurance: When other crops struggle in dry season, cashew thrives
Pollinator support: Flowers attract bees and other pollinators beneficial to the whole farm
Integration Ideas
Cashew works well with:
- Vegetables (shade tolerance) between young trees
- Legumes (nitrogen fixing) as understory
- Chickens (pest control, fertilization) free-ranging below
- Passion fruit or other vines on dead branches
Common Problems and Solutions
Pests
Tea mosquito bug: Major pest causing flower and shoot damage. Control through proper pruning and natural predators.
Stem borers: Larvae tunnel into branches. Remove affected wood.
Diseases
Anthracnose: Fungal disease affecting flowers and young fruit. Improve air circulation through pruning.
Powdery mildew: White coating on leaves. Usually not serious; improves with dry weather.
Environmental Stress
Drought: Established trees tolerate drought well, but young trees need supplemental water.
Waterlogging: Fatal to cashew. Ensure drainage before planting.
Experience Cashew at Mawun Valley Farm
What We Offer
Farm tours: See our 6 cashew trees, learn about cultivation, understand the full plant.
Cashew Apple Jam Cooking Class: August-December. Pick fruit, make jam, take home your creation.
Tasting: Fresh cashew apple (seasonal) and year-round jam at Noni's Cafe.
Extended stays: Our Belong program offers deeper engagement with farm activities including cashew harvest during season.
Why Visit
Most people eat cashews their entire lives without understanding this remarkable tree. Seeing the strange fruit, tasting fresh cashew apple, and learning the full story transforms your relationship with one of the world's favorite nuts.
Message Us on WhatsApp to plan your visit.
Related reading: What is Cashew Apple? | 5 Uses for Cashew Apple | Cashew Farming in Indonesia | Jam Recipe
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