The Texas Grano 502 Onion is a short-day, open-pollinated variety that features white flesh and straw-colored skin. Its mild and sweet flavor gives it excellent eating quality and has been known as the “eat it like an apple” onion. It produces a large round, globe-shaped onion. The Texas Grano 502 grows especially well in Southern climates and is widely used for winter onion production. Sweet flavor and stores well for months.
Onions 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. 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 Ammonium Sulfate 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 Ammonium Sulfate fertilizer. Side dress or inject 1 cup per 20 feet of linear row every 3-4 weeks after transplanting.
Texas Grano 502 Onion Planting Information
Planting Method: transplant
When to Plant: early spring and fall
Planting Depth: 1/4″
Seed Spacing: 4″
Row Spacing: 12-18″
Days to Maturity: 165
Disease Resistance: Pink root, Bolt, Short Day Split
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.
- Plant in fall and overwinter for a spring harvest
- Start the bulbing process when day length reaches 10-12 hours
- Plant in late winter for an early summer harvest
- Start the bulbing process when day length reaches 12-14 hours
- Plant in spring for a mid-summer harvest
- Start the bulbing process when day length reaches 14-16 hours
– Plant in spring for a mid-summer harvest
– Start bulbing when day length reaches 14-16 hours
– Plant in late winter for an early summer harvest
– Start bulbing when day length reaches 12-14 hours
– Plant in fall if temps are rarely below 20F
– Plant in late winter if temps are frequently below 20F
– Start bulbing when day length reaches 10-12 hours
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