You soaked it, you sowed it, you watered it faithfully, and three weeks later there is still nothing. Or worse, you dig it up and find a soft, smelly shell. Cashew seeds are not difficult to germinate, but they are unforgiving of a few specific mistakes. Here are the seven we see most often, and what to do instead.
New to growing cashew? Start with our step-by-step guide: How to Germinate Cashew Seeds at Home.
Mistake 1: Using cashews from the kitchen
This is the number one reason for failure. Edible kaju has been roasted or steamed to remove its shell, and that heat kills the seed. It will never sprout.
Fix: Use raw cashew nuts still in their shell. If the nut you are holding is cream-coloured and smooth, it is food. If it is grey-brown, kidney-shaped and has a tough outer shell, it is a seed.
Mistake 2: Using old seed
Cashew seeds lose their ability to germinate faster than most tree seeds. A nut that has sat in a dry cupboard for a year or more may look perfect but be lifeless inside.
Fix: Sow seed from a recent harvest, and do the float test first. Drop the nuts in water: the ones that sink are well-filled and far more likely to sprout.
Mistake 3: Soaking too long
Soaking helps, but more is not better. After two days, the seed starts to run short of oxygen and the shell can begin to rot before it is even in the soil.
Fix: Soak for 24–48 hours, changing the water every 12 hours. Then sow straight away.
Mistake 4: Sowing it upside down or too deep
Cashew sends out its root and shoot from a particular point. Sown the wrong way, the seedling wastes energy turning around, and some never make it to the surface. Buried 8–10 cm deep, even a healthy seed can run out of stored food before it reaches the light.
Fix: Find the stalk end, the slightly broader end with a small scar where the nut joined the cashew apple. Sow with that end facing up, slightly tilted, and only 2–3 cm deep.
Mistake 5: Overwatering
This is the cause behind most rotten, smelly seeds. Cashew comes from sandy, well-drained coastal soil. In heavy, constantly wet soil, the shell decays before the seed can push out.
Fix: Use a mix of 2 parts soil, 1 part coarse sand and 1 part vermicompost, in a pot with drainage holes. Water only when the top 2 cm of soil is dry. Damp, not wet.
Mistake 6: Sowing in the cold
Cashew is a tropical tree. It germinates best between 25 and 35 °C. Below 20 °C, it slows to a crawl, and a cold, wet pot is a recipe for rot.
Fix: In South India and coastal regions, you can sow almost year-round. In North India, sow between February and July, or keep winter-sown pots indoors by a warm, sunny window. If your seed has gone quiet in cold weather, it may still be alive. Keep it barely moist and wait for warmer days.
Mistake 7: Giving up too early, or digging it up to check
Most cashew seeds sprout in 10–20 days, but some take four weeks. Digging the seed up to look at it can snap the young root, which is the first thing to emerge.
Fix: Mark your sowing date on the pot and leave it undisturbed for at least 30 days before deciding it has failed. If you sow five seeds and two or three sprout, that is a normal, healthy result.
It sprouted! Now what?
Congratulations. The first few months decide how strong your tree will be.
• Sunlight: Once it has 4–6 leaves, give it full sun, at least 6 hours a day.
• Repot only once: Cashew grows a deep taproot and dislikes being moved. Shift it to its final large pot (at least 45 cm deep) or into the ground once, keeping the root ball whole.
• Feed lightly: A handful of vermicompost every month, and neem cake mixed into the soil every two to three months to keep root pests and fungus away. Both are in our fertilizers range.
• Water less as it grows: An established cashew tree is drought-tolerant. Young plants need regular water; trees older than a year need far less.
When will my cashew tree give fruit?
A cashew grown from seed usually starts flowering and fruiting in 3 to 5 years, depending on climate and care. In its first year, pinch off any flowers so the plant puts its energy into roots and branches.
Two honest points worth knowing. First, cashew is a large tree that can reach 10 metres or more, so it fruits best in the ground. A large container works for the first few years. Second, a seed-grown tree may not exactly match the parent in nut size or yield. That is part of the fun of growing from seed: every tree is a little different.
Frequently asked questions
Do I need to remove the shell before sowing?
No. Never crack the shell. It contains a liquid that burns skin, and the seedling breaks out of the shell on its own.
Can I germinate cashew in a paper towel?
You can, but it is not recommended. The root grows fast and is fragile, and moving a sprouted seed from a towel to soil often breaks it. Sowing directly in the pot is safer.
Why did the seedling lift the shell out of the soil?
That is normal. The young stem pushes the shell up like a hook. Leave it; it drops off by itself once the first leaves open.
Can I grow a cashew tree in a pot on my terrace?
For the first 2–3 years, yes, in a large, deep container. For a full-sized fruiting tree, it eventually needs to go in the ground.
The right seed and the right start make all the difference. Our Cashew / Kaju Seeds are whole, raw nuts in shell, packed for sowing. 5 seeds for ₹70, with free delivery on orders over ₹499.
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