Yellow Granex PRR is a classic bulbing onion that delivers reliable performance across hardiness zones 3 through 10. This cultivar produces golden yellow bulbs over 110 to 160 days, thriving in full sun with moderate watering and well-balanced soil. The PRR designation indicates disease resistance that makes this variety dependable for gardeners seeking consistent harvests without constant worry. Whether you're starting from seed indoors or direct sowing, this onion responds well to early starts and rich soil preparation.
Full Sun
Moderate
3-10
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High
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Starting seeds indoors 10 to 12 weeks before your last frost date unlocks the full potential of this variety, yielding noticeably larger bulbs than later sowings. Yellow Granex PRR germinates reliably at soil temperatures of 45°F and thrives once established in the 60 to 85°F sweet spot. Spacing onions 12 inches apart in all directions gives each bulb room to develop its characteristic globe shape without crowding stress.
Yellow Granex bulbs serve as a foundational cooking onion, bringing mild, sweet flavor to soups, stews, caramelized preparations, and roasted dishes. The large, globe-shaped bulbs slice cleanly for fresh use and store well through winter months, making them as valuable in the kitchen as in the garden.
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Sow seeds indoors 10 to 12 weeks before your average last frost date. Plant seeds 1/4 inch deep and maintain soil temperature between 60 and 85°F for best germination and early growth. Transplant seedlings outdoors 4 to 6 weeks before your average last frost date, timing the move to coincide with soil warmth and reduced frost risk.
Harden off seedlings gradually over 7 to 10 days before moving them to the garden. Space transplants 12 inches apart in rows also 12 inches apart, planting at the same depth they grew in their containers. Transplant 4 to 6 weeks before your average last frost date when soil temperature reaches at least 45°F, though 60 to 85°F is ideal.
Sow seeds directly outdoors 4 to 6 weeks before your average last frost date, or as soon as soil can be worked and reaches at least 45°F.
Harvest Yellow Granex PRR bulbs after 110 to 160 days when foliage begins to yellow and fall over naturally, signaling bulb maturity. Gently lift bulbs from the soil and allow them to cure in a warm, dry location with good air circulation for 2 to 3 weeks before storing. Cured onions should have papery outer skin and completely dried necks.
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