- Heat-loving watermelons can be a challenge to grow in cooler regions. To increase success, choose short-season varieties, start them inside, warm soil with black plastic or IRT mulch, and protect young plants with fabric row covers. Seeds or Seedlings 3 to 5 days, 60F to 95F 4 years High Fertility Full Sun 12″ apart 4\’ to 6\’ apart 65 to 86 Growing Guide GROWING NOTES Indoor Starting As they require a long growing season, watermelons are best started indoors approximately 3-4 weeks prior to the last frost of the season. Sow seeds 1/4″ deep in flats or small pots, sowing 3 seeds per pot. Keep medium moist while awaiting germination. Additionally, watermelon seeds will show better germination rates with heat. Keep the soil between 80-90 degrees, using a heat mat if necessary. Seed should begin to germinate within 3-10 days. Once seeds start to germinate, lower soil temp slightly to the mid 70s, for 1-2 weeks, also decreasing water. Thin to one plant per cell or pot. Once the first set of true leaves has developed, reduce waterings once more, but do not allow plant to become desiccated. Harden plant by gradually exposing to outdoor conditions. Transplant to permanent site in late spring after the last frost has passed. If possible, transplant on an overcast day to minimize wilting and create a more amenable environment for your young plant. Outdoor Starting If you have long, hot growing seasons, melons can direct-seed into garden. To ensure ripening in areas with shorter growing seasons and cooler weather, choose fast-maturing varieties, start plants inside, use black or IRT plastic mulch to warm soil and use fabric row covers to protect plants. Direct-seed 1 to 2 weeks after average last frost when soil is 70 F or warmer. Plant 1 inch deep, 6 seeds per hill, hills 4 to 6 feet apart; or 1 foot apart in rows 5 feet apart. Can plant at closer spacings if trellised. Thin to 2 to 3 plants per hill. Choosing a Site Prefers warm, well-drained, soil, high in organic matter with pH 6.5 to 7.5. Consistent, plentiful moisture needed until fruit is about the size of a tennis ball. Soil temperatures below 50 F slow growth. Consider using black plastic and fabric row covers to speed soil warming. Sandy or light-textured soils that warm quickly in spring are best. In many areas, successful crops require starting plants indoors, using plastic mulch to warm soil, and fabric row covers to protect young transplants. MAINTAINING For transplanting, sow seeds indoors ¼ inch deep in peat pots (2-inch square or bigger), 2 to 4 weeks before setting out. Plants should have one or two true leaves when transplanted. Transplant at same spacings as direct-seeded crops – 2 to 3 plants per hill in hills spaced 4 to 6 feet apart, or 1 to 2 feet apart in rows 5 feet apart. Transplants are delicate and roots are sensitive to disturbance. If you need to thin, use scissors. Keep soil intact around plant when transplanting. Mulch plants after soil has warmed to help maintain consistent moisture and suppress weeds. If using fabric row covers, remove at flowering to allow pollination by bees. Good pollination is critical to fruit set. Plants require consistent moisture until pollination. Once fruits are about the size of a tennis ball, only water if soil is dry and leaves show signs of wilting. To prevent insect damage to developing fruits, place melons on pots or pieces of wood. If growing melons on a trellis, support fruit with slings made from netting, fabric, or pantyhose. Trellising improves air circulation around plants and can help reduce foliar disease problems. Choose small-fruited varieties and reduce plant spacing. For large plantings, leave a strip of rye cover crop every second or third row perpendicular to prevailing winds to protect plants from damaging wind. To reduce insect and disease problems, avoid planting cucumber family crops (melons, squash, pumpkins) in the same spot two years in a row. Do not let your melon plants get dried out during the growing season. They are not tolerant of drought. Additionally, be cautious not to over-water plants as this can negatively impact the taste and flavor later on. Keep soil moist but not soggy.
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