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Seeds are planted one inch deep in groups of 3 and seedlings thinned to the best 1 or 2 for planting. Growing watermelon vertically is also beneficial for the plant as it improves ventilation and thus productivity. Start A Fire Watermelon Plant How To Grow Watermelon Growing Vegetables Sow in seed trays in August and transplant seedlings from October to December. . Watermelons plants can be encouraged to grow up frames to reduce damage to the fruit. Or if your growing season is long enough direct sow seeds in the outdoor garden two weeks after the last frost. Getty Images If deciding to grow watermelons vertically your first question will be how tall should a watermelon trellis be The answer is that a watermelon trellis should be between 5ft tall for smaller varieties and around 7ft for larger. It is an important detail that the temperature of the soil is 12 degrees. Soil Selection It is important that the soil where the wate...