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You can find jalapeno pepper seeds at a garden or home improvement store, as well as online. If you already have a jalapeno plant, you can cut open a mature pepper and use those seeds for planting. You can find a seed-starting mix at your local garden or home improvement store, as well as seed trays perfect for starting small seedlings. Fill each space in the seed tray about ¾ of the way full with the soil. Pour the jalapeno seeds into your palm and drop a few into each section of the seed tray. Try to space them evenly so that they’re not on top of each other, even if they don’t all grow. You don’t need to push them down into the soil, just place each one in the soil gently. A fine sprinkling of soil will do—you just want the seeds covered with a light layer of soil so that water or wind doesn’t move them. Use the same soil that you used to fill the seed tray. While you don’t want to drench the seeds in water, they’ll need to be properly hydrated in order to grow. Use a spray bottle to dampen the soil after the seeds are planted, and check the soil each day to make sure it isn’t dry. Make sure the seed trays have proper air ventilation so that the soil doesn’t become soggy. If you live in a climate that gets lots of warm sun, put the seed trays near a windowsill so that they can get sunlight. You can also use artificial light from lamps to heat up the seeds and help them grow, if necessary.  If you’re going to use artificial lighting, hang growing lights 2–4 inches (5.1–10.2 cm) above the plants. If you notice the seedling starting to wilt, the lights may be too close. How long it takes for the seeds to germinate will depend on the growing conditions, such as the amount of sunlight, water, and soil temperature. By 5 weeks, your seeds should have started growing into small seedlings. Some types of jalapeno seeds only take about 10 days to germinate, so keep an eye on your plant daily to check for progress. When it has reached this height, it’s strong enough to be moved to a larger pot for more growing space. Use nutrient-rich potting soil when you transfer the plant, and make sure to give it full sunlight and plenty of water. Another way to tell if the plant is ready to be repotted is to look for at least 4 leaves.

Summary:
Purchase jalapeno seeds or use seeds from your own jalapenos. Fill a seed tray with seed-starting mix. Place 1-3 seeds in each seed tray. Cover the seeds with a thin layer of soil. Mist the soil with water when it becomes dry. Expose the seeds to light for up to 16 hours a day. Wait 3-5 weeks for the seeds to germinate. Transfer the plant to a larger pot when it’s at least 2 inches (5.1 cm) tall.