Onion Long Day Seeds

Onion Long Day Seeds

10 products

    Onion bulbing is triggered by day length, making it essential to select varieties suited to your region’s photoperiod to ensure full-size bulbs by harvest. Onions are classified into long-day, intermediate-day, and short-day types, each adapted to specific day-length conditions. Choosing the right variety optimizes bulb development, size, shape, color, and storage life. Use our detailed guide to compare key traits and identify the best onions for your growing season, ensuring a successful and productive harvest.

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    10 products
    A single onion with a green top, resting in a brown bowl on a wooden surface.
    Onion Long Day Walla Walla 100 Non-GMO, Heirloom Seeds
    David's Garden Seeds®
    A hand holding a bunch of red elongated onion bulbs freshly harvested from the ground.
    Onion Long Day Red Long Of Tropea 100 Non-GMO, Organic, Heirloom Seeds
    David's Garden Seeds®
    Red onions on a wooden surface with one onion sliced open.
    Onion Long Day Ruby Red 200 Non-GMO, Heirloom Seeds
    David's Garden Seeds®
    Three whole onions with a light brown skin, resting in a wooden bowl.
    Onion Long Day Ailsa Craig Exhibition 200 Non-GMO, Heirloom Seeds
    David's Garden Seeds®
    A group of medium-large yellow onions with thin necks, displayed on a wooden surface.
    Onion Long Day Patterson 200 Non-GMO, Hybrid Seeds
    David's Garden Seeds®
    Three onion bulbs in a woven basket, with a background of a wooden texture.
    Onion Long Day Bridger 100 Non-GMO, Hybrid Seeds
    David's Garden Seeds®
    Three globe-shaped red onions with a deep maroon color, displayed on a burlap surface with a wooden background.
    Onion Long Day Cabernet 100 Non-GMO, Hybrid Seeds
    David's Garden Seeds®
    Three yellow onions with a flat, round shape, resting on a white surface with a wooden background.
    Onion Long Day Gold Coin 200 Non-GMO, Heirloom Seeds
    David's Garden Seeds®
    A single red onion bulb in a wooden bowl on a wooden surface.
    Onion Long Day Red Rock 100 Non-GMO, Hybrid Seeds
    David's Garden Seeds®
    A group of Patterson onions with dark yellow skin, displayed on a wooden surface.
    Pelleted Seed Onion Long Day Patterson 4 Sizes Available
    David's Garden Seeds®