Back To Top Sources There are many different sources of watermelon cultivars. Hot caps and floating row covers may prove useful for earlier production. Planting Location Watermelons grow best on a deep sandy loam soil high in organic matter, well drained and slightly acidic. When planted on very heavy soils, the plants develop slowly, and fruit size and quality are usually inferior. Yields on clay soils can be increased significantly by mulching with black plastic film to conserve moisture.
Fine sands produce the highest quality melons when adequate fertilizer and water are provided.
To reduce the risk of diseases, do not plant on land where vine crops have grown during the past four years. Avoid low, damp areas or pockets where cool air may collect. Soil pH can vary from 5.5 to 8. Don't be concerned with adjusting soil pH unless it is below 5.8. Spacing and Depth of Planting Watermelon vines require a lot of space.