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Wait until after the last frost to plant hemp seeds. Check the temperature 1 inch (2.5 cm) deep with a soil thermometer to see if it’s above 50 °F (10 °C). Once the temperature has been consistent for a few days, you can plant your seeds.  Check the estimate for your last frost date here: https://www.almanac.com/gardening/frostdates. Hemp grows best when the outdoor temperature us between 60–80 °F (16–27 °C). Check the pH of the soil with a probe or paper test strips to see if the soil has the right growing conditions. Break the soil up using a hoe or tiller to aerate it. While hemp grows in most soils, poorly-drained soil could cause damage to your plants.  Test the drainage by digging a 1 × 1 × 1 ft (30 × 30 × 30 cm) hole and filling it with water. Time how long it takes for the water to completely drain and if it’s longer than 1 hour, find a different location.  It’s easier to find a place with healthy soil conditions rather than amending your existing soil. Use a seed drill attached to a lawnmower or tractor to space your seeds evenly and cover them with soil. Pour the seeds into the hopper and let the machine do the work for you. The machine will also bury the seeds to the correct depth so birds and pests can’t get to them.  Keep the seeds closer together if you want to grow hemp for fibers since this will make them grow up rather than branch out. Spread the seeds further apart if you want to harvest seeds. This encourages the plants to branch out and grow shorter. Clean the machine after you use it. Ask local farm machinery stores to see if they have seed drills available to buy or rent.
Plant hemp seeds in late spring. Grow hemp in a field with well-aerated soil with a pH between 6-7.5. Put the seeds 3⁄4–1 1⁄4 inches (1.9–3.2 cm) deep.