How to Germinate Cashew Seeds at Home: A Step-by-Step Guide

The cashew is one of the few trees that hands you its seed in plain sight. That kidney-shaped nut hanging below the cashew apple is the seed. Inside its shell is the kaju we eat. Plant it right, and in two to three weeks you will see a thick green shoot push out of the soil.

Cashew (Anacardium occidentale) grows happily across Kerala, Karnataka, Goa, Konkan Maharashtra, coastal Andhra and Odisha. It is hardy, drought-tolerant once established, and does well in poor soil. The only stage that needs real care is germination. This guide walks you through it.

First, the most important rule: kitchen kaju will not grow

The cashews you buy to eat have already been taken out of their shell. To do that, they are roasted or steamed, which kills the seed. No amount of soaking will bring them back.

For germination you need raw cashew nuts still in their shell, fresh from a recent harvest. They are grey-green to brown, kidney-shaped and about 3 cm long. Our Cashew / Kaju Seeds are exactly this: whole, unprocessed nuts in shell, packed for sowing.

A safety note before you start

The cashew shell contains a brown, oily liquid that can burn and blister skin. It is the reason cashews are never sold in their shell for eating.

• Wear gloves when you handle and soak the nuts.

• Never bite, crack or cut the shell.

• Wash your hands afterwards and keep the seeds away from children and pets.

You do not need to open the shell at any stage. The seedling breaks out on its own.

What you need

• Fresh cashew seeds in shell

• A bowl of clean water

• A deep pot or a grow bag, at least 25–30 cm deep (cashew grows a long taproot fast)

• Potting mix: 2 parts garden soil, 1 part coarse sand, 1 part vermicompost

• A warm, bright spot

Step 1: Do the float test

Drop your seeds into a bowl of water. Seeds that sink are heavy and well-filled, and are the ones most likely to germinate. Seeds that float are often hollow or dried out. You can still sow a floater, but expect a lower success rate.

Step 2: Soak for 24–48 hours

Leave the seeds in water for one to two days, changing the water every 12 hours. Soaking softens the hard shell and tells the seed it is time to grow. Do not soak beyond 48 hours; the seed can start to rot.

Step 3: Prepare the pot

Fill the pot with your soil, sand and vermicompost mix. Cashew hates waterlogged roots, so the sand matters, and the pot must have drainage holes. Water the mix well and let the extra drain out before you sow.

Step 4: Sow it the right way up

This is where most people go wrong. Look at your nut. One end is slightly broader and has a small scar where it was attached to the cashew apple. That is the stalk end.

1. Press the seed into the soil with the stalk end facing up, tilted slightly.

2. Cover it with 2–3 cm of soil. Do not bury it deeper.

3. Firm the soil gently with your fingers and water lightly.

Sow one seed per pot. If you are sowing several, space them at least 15 cm apart in a large bed so you can lift them later without tearing roots.

Step 5: Keep it warm and evenly moist

Cashew seeds germinate best at 25–35 °C. Keep the pot somewhere warm with bright light, such as a sunny balcony or near a south-facing wall.

Water whenever the top 2 cm of soil feels dry. The soil should feel like a wrung-out sponge: damp, never soggy. Overwatering is the most common reason cashew seeds rot.

Step 6: Wait for the shoot

Most cashew seeds sprout in 10 to 20 days. Some take up to four weeks, especially in cooler weather, so do not give up early. You will first see a thick, curved stem lift the shell up out of the soil, like a hook. Leave the shell alone; the seedling drops it on its own as the first leaves open.

When is the best time to sow cashew in India?

The traditional window is the start of the monsoon, from May to July, when it is warm and humid. In South India and coastal areas, you can sow almost all year, including now, in October.

In North India, nights get cool from November. Germination slows sharply below 20 °C. If you are sowing there in winter, keep the pot indoors near a sunny window, or wait for February–March when the warmth returns.

After germination

Once the seedling has four to six leaves, usually 4–6 weeks after sprouting, move it to full sun. If it is in a small pot, shift it to a bigger one or into the ground now, keeping the root ball whole. Cashew does not like its taproot disturbed, so move it once, gently, rather than repotting again and again.

Feed lightly every month with vermicompost, and mix a handful of neem cake into the soil to keep root pests away. You will find both in our fertilizers range.

Quick summary

Growing a cashew from seed is slow, but it is one of the most satisfying trees you can raise. Ready to start? Get our Cashew / Kaju Seeds — 5 seeds for ₹70. Five seeds give you a good chance of at least two or three strong seedlings.

Seed not sprouting? Read our follow-up: Why Your Cashew Seed Won't Sprout: 7 Mistakes and How to Fix Them