Texas Supersweet 1015y is a legendary short-day onion that has defined sweet onion growing across the American South for decades. Named for its October-November planting window and 1015 spacing (10 inches between rows, 1.5 inches between plants), this cultivar delivers bulbs so mild and tender they're often eaten like apples straight from the garden. Expect to harvest in about 175 days, with bulbs that develop that characteristic papery golden skin once properly cured.
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This onion's supersweet reputation comes from its ability to accumulate exceptional sugar levels while staying remarkably mild, making it genuinely enjoyable raw in salads or caramelized into deep, jammy richness. The variety thrives in Texas and similar warm-winter regions where its photoperiodic nature triggers bulbing at precisely the right moment. Its name encodes everything a grower needs to know: plant in October-November spacing at 10 inches by 1.5 inches, and you'll understand why it's become a cornerstone of Southern kitchen gardens.
Texas Supersweet 1015y shines brightest when eaten fresh, sliced raw into salads where its natural sweetness and tender texture require no cooking to shine. It's equally at home caramelized slowly in butter until the sugars concentrate into a sweet, savory glaze for burgers, steaks, or French onion soup. Many gardeners in Texas and the Lower South treat these bulbs almost like a delicacy, keeping them cool and eating them through winter as a prized storage crop.
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Sow seeds up to 10-12 per 4-6 inch pot indoors. If seedling tops exceed 5 inches before transplant time, cut them back to 3 inches to promote stronger root development.
When seedlings are ready, carefully separate them and set each in a shallow trench at the proper spacing (2 inches apart, 12 inches between rows). Fill the trench around the seedlings and water thoroughly.
Direct seed by thinning to the strongest plant when seedlings reach 4-5 inches tall. Days to maturity are calculated from the date of direct seeding.
Harvest when about half the tops have fallen over naturally. Push over any remaining upright tops and wait approximately one week before pulling bulbs. Cure bulbs in a warm (75-80°F), shaded, well-ventilated location for 2-4 weeks until the outer skin and necks are completely dry. Once cured, trim the tops, leaving one inch above the bulb.
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