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Check with your local nursery or an Asian market to see if they carry jackfruit seeds. If not, you can find seeds available to purchase online. If you have access to ripe jackfruit, you can also harvest seeds from the fruit. Rinse the seeds with warm water to remove the sticky pulp. Place your seeds in a bowl or container with lukewarm water. Let them sit for a full day before sowing them. Soaking seeds will speed up the germination process and make your seedlings grow faster. Use a plastic pot with drainage holes so water can easily flow out from the bottom. Use a well-draining potting mix with perlite, sand, and organic compost to achieve the best drainage in your pot. Premixed potting soil can be purchased at gardening stores, or you can make your own. Space the seeds evenly near the center of the pot. Don't let the seeds grow near the edges, otherwise the roots may not develop fully. Cover the seeds and press down slightly to compact the potting mix. You can plant more seeds in the pot, but they will be competing for resources and may not grow as well. Keep the soil moist, but make sure that it is not overwatered. Stick your finger into the soil up to the first knuckle to feel if it's wet. If it isn't, water the seeds. Even though jackfruit grows in humid, tropical regions with a lot of rainfall, too much water can cause the seeds and roots to rot. Try to use untreated or distilled water when starting off your seedlings. If you can, keep the pot outdoors during the warmest parts of the day. When the temperature gets near freezing, bring the pot indoors and keep it on a windowsill or near a window so it receives sunlight. A heat lamp indoors is a great substitute if the weather outside is not cooperating. It will take 2-3 weeks for your seedlings to germinate. Look for seedlings that have grown the tallest and have healthy looking leaves. Remove the weaker seedlings by gently pulling them out of the soil. Avoid using seedlings that are spindly or have grown near the edge of the pot. Their root systems will not have spread and developed fully.
Purchase jackfruit seeds. Soak the seeds in water for 24 hours. Fill a 1USgal (3.8L) pot with potting mix. Plant 3 seeds 1in (2.5cm) deep in the soil. Water the seeds every day. Keep the pot in a warm, sunny area. Thin down to 1 healthy seedling after they've started germinating.