Cashew Tree

A tropical evergreen tree that produces nuts attached to the bottom of a fleshy false fruit called the cashew apple. The raw nut shell contains caustic oil related to poison ivy and must be carefully roasted before the kernel can be safely extracted. Cashew trees are drought-tolerant once established and grow well in sandy, well-drained tropical soils. They begin bearing within three years and are surprisingly low-maintenance in suitable climates.

Cashew trees are easily grown from fresh seed. Select plump, heavy nuts from productive mother trees and float-test them, discarding any that float. Sow seeds directly in large pots or in the ground, planting 2 inches deep with the curved side up. Germination occurs in 2 to 3 weeks in warm conditions. Seeds lose viability quickly, so plant within a few weeks of harvest. Transplant seedlings to their permanent location when 8 to 12 inches tall. Air layering and grafting of superior varieties is also common.

The Season Plate

Your Cashew Tree Year

Composed for Zone 7 · typical seasons · frost passes Apr 2, returns Nov 1

Sow Cashew Tree Apr – Jun, pick Feb – May. Set your climate below and every date on this plate re-times itself.

Sowing window

Apr – Jun

re-timed to your frost dates

Plant out

after Apr 2

once frost risk has passed

First picking

around Apr 14

≈ 1095 days from sowing · 2-5 kg per plant

Composed for —ColdTemperateMildWarmUse my locationUsed once to set your season · only the zone is kept

Week-by-week Cashew Tree reminders watering, feeding and pruning, timed to your dates

In the app

Frost alerts for your garden a warning before a cold night costs you the crop

In the app

Succession sowing dates so the picking never gaps mid-season

In the app

Keep my dates — free for 7 daysWe nudge you as each window opens · cancel anytime

Cashew trees thrive in tropical and subtropical climates with temperatures between 70 and 95 degrees Fahrenheit and a distinct dry season. Plant in full sun in sandy, well-drained soil with a pH of 5.0 to 6.5. Cashews are remarkably drought-tolerant once established and actually require a dry period to flower and fruit properly. Space trees 25 to 30 feet apart and water young trees regularly during their first year.

Cashew trees grow quickly, reaching 15 to 30 feet tall with a spreading canopy. They begin flowering and producing nuts within 3 to 5 years from planting. The trees are evergreen in consistently warm climates but may become semi-deciduous where dry seasons are more pronounced. Minimal pruning is needed beyond removing dead wood and low-hanging branches.

The most important consideration for home growers is that raw cashew shells contain urushiol, the same irritant found in poison ivy. Never attempt to crack and eat raw cashew nuts. The shells must be roasted at high temperatures to neutralize the caustic oil before the kernels can be safely extracted. Commercial processing involves specialized equipment for this reason.

Interplant young cashew orchards with short-term crops like beans, peanuts, cassava, or sweet potatoes to generate income while trees mature. Leguminous cover crops like cowpeas and pigeon peas fix nitrogen and improve soil fertility between rows. Basil and marigolds planted around cashew trees help repel insect pests and attract pollinators. Once the canopy closes, shade-tolerant crops like ginger and turmeric can be grown beneath the trees.

The Society Table

Basil belongs beside it.

Old growers' knowledge, checked against Cashew Tree's real companion table below — test any plant you're growing.

Grows well in the company of · 2

BasilMarigold

Keep apart · 0

no recorded foes

Plant Cashew Tree with good neighboursThe planner flags conflicts before they're in the ground

Cashew trees prefer sandy, well-drained, slightly acidic soil with a pH of 5.0 to 6.5. They tolerate poor, infertile soils remarkably well but produce better with moderate fertility. Apply a balanced NPK fertilizer twice yearly, in early rainy season and after harvest. Young trees benefit from additional nitrogen to promote canopy development. Avoid waterlogged soils at all costs, as cashews are highly susceptible to root rot in wet conditions. Organic mulch helps retain moisture during dry periods.

Ideal Temperature

Hardiness Zone Compatibility

Cashew nuts are ready to harvest when the cashew apple turns bright red or yellow and the nut at the bottom is gray-green and fully developed, typically February through May. The nut and apple detach from the tree when ripe and can be gathered from the ground. Twist the nut from the apple immediately after harvest. Sun-dry the raw nuts for 2 to 3 days before processing. Remember that raw cashew shells are caustic and must be roasted by experienced processors before the edible kernel can be safely extracted.

Storage & Preservation

Dried raw cashew nuts in their shells store for up to a year in a dry, ventilated space. Roasted and shelled cashew kernels should be stored in airtight containers at cool temperatures, keeping for 2 to 3 months at room temperature or up to 6 months refrigerated. Freeze shelled cashews for up to a year. The cashew apple is highly perishable and must be consumed fresh, juiced, or fermented into cashew wine within a day or two of harvest.

Troubleshooting Common Problems

The caustic shell oil is the primary safety concern for home growers, as improper handling causes severe skin burns similar to poison ivy. Processing cashews requires specialized knowledge and equipment. Tea mosquito bug damage during flowering can devastate the crop. Trees are frost-intolerant and die at temperatures below 40 degrees Fahrenheit. The cashew apple is rarely utilized outside tropical regions due to its extreme perishability and astringent taste when raw.

Growing Tips

1. Choose grafted or air-layered saplings of proven high-yield varieties like Vengurla-4, BPP-8, or Ullal-3 rather than seedlings, as they produce sooner (2-3 years vs 4-5 years) and have more predictable nut quality.
2. Plant in well-draining sandy loam or laterite soil with a pH between 5.0 and 6.5. Cashew trees are highly sensitive to waterlogging, which can cause fatal root rot within weeks.
3. Space trees 8 to 10 meters apart in an orchard setting to allow full canopy development. Closer spacing of 5 to 6 meters can be used with regular pruning in high-density planting systems.
4. Provide full sun exposure — cashew trees require at least 6 to 8 hours of direct sunlight daily for optimal flowering and nut production. Shaded trees produce significantly fewer panicles.
5. Water young trees regularly during the first two dry seasons to establish deep root systems, then reduce irrigation. Mature cashew trees are remarkably drought-tolerant and often perform best with a pronounced dry season to trigger flowering.
6. Apply a split fertilizer program: nitrogen-heavy blends during vegetative growth flushes, then switch to phosphorus and potassium-dominant formulas before flowering to maximize nut set and kernel weight.
7. Protect developing nuts from tea mosquito bug (Helopeltis antonii) by applying approved insecticides at panicle emergence and again during early nut development. This single pest can reduce yields by 30-40% if left unchecked.
8. Handle raw cashew nuts with gloves during harvest and processing. The shell contains anacardic acid and cardol, which are chemically similar to urushiol in poison ivy and can cause severe contact dermatitis.
9. Prune trees annually after harvest to remove dead wood, crossing branches, and water sprouts. Good airflow through the canopy reduces fungal diseases like anthracnose and powdery mildew.
10. In subtropical or marginal climates (USDA zones 10-11), plant cashew trees in a sheltered south-facing location near a thermal mass such as a wall or building to protect from occasional cool nights below 15°C.