What is a candy onion

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Candy Onion is a hybrid, day-neutral or intermediate-day onion variety that performs well in a wide-range of conditions. This onion variety will perform well in all regions with the exception of the deep south and the far north areas of the country. It produces a sweet, round bulb that is slightly flattened, but not as much as a typical granex or Vidalia variety. It matures relatively early and will store for months once harvested and cured correctly.

Candy 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. Candy Onion seeds can be planted with our Hoss Garden Seeder. We recommend using a #3 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.

Candy 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: 85

Disease Resistance: None

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

This Thanksgiving, my grandfather arrived at the house bearing a surprise: a half bushel of delicious cameo apples and a bunch of candy onions straight from the Amish produce auction. After gorging all day Thursday, we took more than our fair share of apples and onions, schlepping them early Friday morning from Gap, to the train station, to DC and work, back to the train station, and then finally all the way home to Baltimore. It was a long, hard, heavy journey. But in the end, it was completely worth it.

What is a candy onion
Everyone knows about apples, but I’d never tasted a candy onion until this weekend. A candy onion is a mild, sweet onion with a firm texture. The best way to bring out their sweetness is to grill or saute them and layer them on hamburgers (which will plan on doing tonight) or pizza (tomorrow).

For grilling, slice the onion in 1/2 inch thick slices. Rub olive oil, pepper, and salt onto the rings (don’t separate the rings within the slices, if that makes sense) and transfer them to the grill. Grill them for 15 to 20 minutes on medium heat until they are nicely browned and smell delicious. Pop them on top of your burger.

For sauteing, slice the onion into thick slices, but this time separate the rings. Heat a pan with olive oil over medium low heat. Pour the onions into the heated pan and cook for 30 to 50 minutes (depending on how sweet you want your onions; the longer you cook them, the sweeter they’ll get), stirring every 7 or 8 minutes. Layer them on top of your pizza. And voila!

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Although not quite as sweet as their name implies, candy onions (Allium cepa 'Candy') are nonetheless milder than other pungent, tear-inducing varieties. After the success of other sweet onions, such as Walla Walla for cold climates and Vidalia for warm regions, the candy onion plant was bred as a sweet-onion choice that is adapted to a diversity of climates.

Bonnie Plants describes candy onions as jumbo bulbs up to 6 inches in diameter with 2-foot tops. The yellow skinned onions are globular in shape. Boasting a mild and sweet flavor, candy onions also feature long lasting quality.

Bulbing onion plants, such as candy onions, begin forming bulbs when daylight hours are of certain durations, called photoperiods. Depending on the specific photoperiod that bulbing types require for bulb formation, onions are classified as long-day, short-day or day-neutral types. Long-day types grow best in cold, northern climates, while short-day types are suited for warmer, southern and coastal regions. Day-neutral types have been bred for success in almost all climates and are not affected by the number of hours of daylight they receive. Candy onions are day-neutral types.

You can grow your candy onions from seeds, sets or starts, according to Clemson University Home and Garden Information Center. Because seeds take longer to grow to mature plants, most gardeners use sets or starts. Sets are small bulbs, which grow to larger sizes after planting. Starts are small plants that are generally 8 to 10 weeks old, which have not formed bulbs yet.

To grow your own candy onion sets, start by sowing seeds in summer. Two to three months after sowing, roll down the green stems, which forces plants to set small bulbs. When the sets are the size of dimes, dig plants and trim stems ½ inch above the sets. You’ll plant these sets the following spring, after storing them in a cool, dry place.

You can grow candy onion plants in almost any soil type as long as it is fertile and has good drainage. Onions are shallow-rooted and may suffer in weedy locations. Weeds pull water and nutrients from developing onion plants, which stunts growth and hinders a good harvest. Keep garden beds weeded around onions, with shallow cultivation, so you don’t damage onion roots. Onion plants thrive in raised beds, which contain loose soil and offer good drainage. Onions respond well to applications of compost, which you can work into the soil before planting or side-dress along plants.

Harvest candy onion plants when their green stems fall over and turn brown. A curing process is required before you store onions successfully. After you dig them, remove the dirt and place them in a well-ventilated area until the necks, or the area just above bulbs, are completely dry, which generally takes two weeks. Root cellars, unheated garages or other cool, dry areas are best for storing onions, which should be in ventilated containers. Sweet candy onions do not store as long as stronger varieties, but with proper storage you can extend their shelf life.