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1015Y Texas SuperSweet Onion


1015Y Texas SuperSweet Onion is short-day onion that’s one of the most popular sweet onion varieties. Produces large, yellow sweet onions that average 1 lb and 4-5″ in diameter. Allium cepa. 115 days to maturity.

Treatment: Untreated


1015Y Texas SuperSweet Onion is a large, yellow sweet onion with a slightly-flattened (granex) shape. This is one of the most popular short-day, sweet onion varieties for good reason. Although the maturity date is slightly longer than most short-day varieties, the size and taste of these onions are well worth it. The name is derived from the suggested time to plant this variety, October 15th. 1015Y was developed by Texas A&M University and produces sweet onions that average 1 lb and 4-5" in diameter. These onions will typically store for 2-3 months.


    Growing Information

    1015Y Texas SuperSweet Onion can be direct-seeded or transplanted, although we recommend transplanting. For direct-seeding, plant seeds 2″ apart along the row with a row spacing of 24″. Once seedlings emerge, thin seedlings to a 6″ plant spacing along the row. 1015Y Texas SuperSweet Onion seeds can be planted with our Hoss Garden Seeder. We recommend using a #1 seed plate and modifying the hole size slightly to accommodate the onion variety being planted. For denser plantings, more holes may need to be drilled to accommodate a thicker spacing.

    For transplanting, plant one seed per cell in our heavy-duty seed starting trays. Once the green stems reach 6-8″ in length and/or they can be easily pulled from the seed trays, the transplants are ready to go in the ground. Transplant onions 4-6″ apart along the row with a row spacing of 24″. If drip irrigation is used, onions may be planted on double rows with drip irrigation in the middle. We suggest burying the drip tape 3-4″ deep and planting on both sides of the tape.

    Onions are heavy feeders and will require significant nutrient inputs throughout their lifespan. We recommend feeding them with our 20-20-20 and Calcium Nitrate fertilizers. Fertilize with 20-20-20 shortly after transplanting. The phosphorous and potassium in the 20-20-20 fertilizer will help to promote solid root development, while the nitrogen will promote vegetative growth. Once transplants are established, we recommend side-dressing or injecting with our Calcium Nitrate fertilizer. Side dress or inject 1 cup per 20 feet of linear row every 3-4 weeks after transplanting.

    1015Y Texas SuperSweet Onion Planting Information

    Planting Method: transplant

    When to Plant: early fall

    Planting Depth: 1/4″

    Seed Spacing: 4″

    Row Spacing: 12-18″

    Days to Maturity: 115

    Disease Tolerance: Pink Root

    Additional Information

    Onion Planting Guide

    Select an onion variety based on your geographical location. In many cases, intermediate-day varieties can be grown in southern long-day regions and northern short-day regions.

    Short-day Onions

    • Plant in fall and overwinter for a spring harvest
    • Start the bulbing process when day length reaches 10-12 hours

    Intermediate-day Onions

    • Plant in late winter for an early summer harvest
    • Start the bulbing process when day length reaches 12-14 hours

    Long-day Onions

    • Plant in spring for a mid-summer harvest
    • Start the bulbing process when day length reaches 14-16 hours

    Customer Reviews

    Based on 3 reviews
    Onion seeds

    I started them in my hot house and I would 99% started they are fantastic

    Sony Miller
    All seeds germinated.

    Shipped fast and ALL seeds germinated! Package was even fancy!

    Nashville, TN
    (Zone 7)


    Order was easy and delivered promptly