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Step 1
Till or turn over the soil for the watermelon patch around the date of the average last frost. Rake out all weeds, grass and debris. Once you have it free of weeds, work compost into the soil for nutrition and drainage. The location should be in full sun with good air circulation. This should be done 3 weeks prior to planting so you can get rid of weeds that come up in the meantime.
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Step 2
Make 6-inch mounds 6 feet apart to plant seeds. Rows should be at least 6 feet apart, also. Plant 3 or 4 seeds in each mound about 1-inch deep, 3 weeks after the last average frost date. Seeds started in peat pots 3 weeks prior can be planted to one pot holding 2 to 3 plants per mound. Apply a slow-release balanced fertilizer.
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Step 3
Water generously after planting to ensure the the seeds germinate. Keep the soil moist until you have seedlings. Once you have seedlings, cut the watering back to when the soil feels dry to an inch deep. Water at the ground level so the leaves remain dry or it can cause a mildew problem.
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Step 4
Mulch around the seedlings to help retain moisture and keep weeds from coming up. Watermelon does not compete well with weeds for moisture and nutrition. Add nitrogen about a month after planting to encourage good vines.
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Step 5
Harvest watermelons when the curly tendril at the stem turns brown. The underside of the melon where it's laying on the ground will also start to turn yellow.
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Step 6
Take the seeds from the melon when you cut it open. Wash them with a mild dishwashing soap and allow them to dry. Keep them dry until the next planting season to grow more watermelons.
