What Are Candy Onions? Taste, Uses and How to Grow Them

AvatarByEric Dawson Updated Candy & Chocolate

Candy onions are a hybrid sweet onion bred for mild, sugary flavor rather than bite. They form large globe-shaped bulbs, often five to six inches across, with thin papery skin over white, firm, juicy flesh. What sets them apart is chemistry: they carry far less of the sulfur compounds and pyruvic acid that make a regular onion sharp, so raw slices taste sweet instead of hot. Gardeners like the variety because it is day-neutral, disease resistant and ready in roughly 85 to 100 days. Cooks like it because the sugar caramelizes fast. The trade-off sits in storage, since a juicier onion keeps for months rather than most of a year.

What Candy Onions Are

The name describes a flavor, not a confectionery product. Candy is a hybrid onion variety sold as seed or as bare-root transplants, and it belongs to the group growers call sweet onions. Bulbs run large, averaging five to six inches in diameter, with a rounded globe shape. Outer skin is thin and papery, somewhere between light brown and yellow, and the flesh inside is white, firm and juicy. Seed catalogs including Rohrer Seeds list the variety at 85 to 100 days to maturity, while Dixondale Farms, which ships transplants rather than seed, puts its own stock in the 90 to 100 day range.

Classification matters more than it sounds. Candy is described as day-neutral or intermediate-day, meaning it needs somewhere near 14 to 16 hours of daylight to size up a bulb properly. That range is why the variety travels well. It performs across a wide middle band of the country instead of being locked to the far north or the deep south, and growers in Washington, California and Idaho all raise it. No certification body controls where it may be planted, which is the opposite of how some famous sweet onions work.

Hybrid vigor is part of the appeal too. Plants build strong root systems and carry noted disease resistance, and that combination is a large part of why seed companies push Candy at people growing onions for the first time. Fewer things go wrong in the ground. Most of the ways a home crop fails happen after harvest instead, which is why the curing and storage sections below get more space than the planting ones.

How Candy Onions Differ from Regular Onions

Pungency in an onion comes from sulfur compounds, and the standard laboratory proxy for it is pyruvic acid. Regular cooking onions test in the 10 to 14 percent range on that measure. Candy sits under 5 percent, roughly half, which is the whole reason a slice can go straight onto a sandwich without taking the sandwich over. Water content is the other half of the story, because sweet varieties carry more of it and the extra moisture dilutes whatever sharpness remains.

Sweetness here is partly an absence and partly real sugar. Lower sulfur means nothing masks the sugar that is present, and there is enough sugar that the onions brown quickly in a hot pan. Practical effect for a cook: less eye watering during prep, no harsh aftertaste raw, and faster caramelizing on the stove. Cost to a grower: an onion that will not sit in a crate all winter.

Candy vs Vidalia and Other Sweet Onion Varieties

Vidalia is the name most shoppers know, and the comparison is fair without being exact. Only growers in a defined part of Georgia may use that name, under certification rules covering where the crop is planted. Candy carries no such restriction and turns up wherever the climate suits it. In taste trials the hybrid has come out almost as sweet as Vidalia, a shade milder at the finish.

Variety Typical Availability Flavor Where It Is Grown
Candy Varies by region, not tied to one season Mild, sweet, juicy Washington, California, Idaho and other US regions
Vidalia April to August Sweet with a nutty note Georgia only, certified
Walla Walla June to September Sweet and mild Pacific Northwest
Texas 1015 April to June Sweet and mild Texas
Maui April to August, close to year-round Sweet and mild Hawaii

Seasonal windows explain a lot of supermarket confusion. Texas 1015 shows up roughly April through June, Walla Walla runs June through September, and Maui fills in from April into August with near year-round supply. Candy availability depends on where a particular crop was grown rather than on a single regional season, so the same variety can reach two stores at different times of year.

What Candy Onions Taste Like

Raw, the flavor reads sweet and clean, with a juicy crunch and almost no burn. Cooked slowly, it turns savory and rich, and the edges go deep brown well before a storage onion would. Roasting halves cut side down concentrates that sweetness further. Grilling does the same job faster, though the high water content means slices collapse quickly, so cut them thick if you want them to hold their shape over the grate.

Why the Sugar Matters in Cooking

Caramelizing is where the variety earns its keep. Sugar browns faster than a sharp onion’s would, which shortens pan time for a glaze, a French style soup base, or the heap of onions that goes on a burger. Watch the heat, because the same sugar that browns fast also scorches fast. A lower flame and a little patience beat high heat here, and a pinch of salt early pulls moisture out so the browning can start.

Nutrition in Brief

Onions are not a supplement, and Candy is no exception. The variety supplies vitamin C, folate and other B vitamins, dietary fiber that helps digestion and gut health, and quercetin, a flavonoid studied for antioxidant and anti-inflammatory activity. None of that turns a vegetable into a treatment. Anyone changing their diet for a medical reason, including anyone managing blood sugar or recovering from surgery, should check with a doctor first.

How to Grow Candy Onions from Seed or Transplant

Two routes exist. Seed is cheap and gives the longest lead time; transplants from a specialist grower skip the fussiest stage and cost more. Either way the plant wants full sun and loose, well-drained soil with plenty of organic matter worked in, at a pH of 6.0 to 6.8.

Starting Seeds Indoors

  1. Sow indoors. Start seed 10 to 12 weeks before your average last frost date. Germination usually takes 10 to 14 days.
  2. Or direct sow. Where the ground works early, seed can go outside in late February or March.
  3. Set transplants out. Late April into early May suits most of the country, and mid-spring is the general rule.
  4. Space them. Six inches between plants, 24 inches between rows.
  5. Feed and water. Candy builds a strong root system, but it still wants steady nitrogen through the season and frequent watering rather than one heavy soak now and then.
  6. Mulch. A layer of mulch holds soil moisture and keeps weeds down, which is exactly what it is there for.

Timing is the part people get wrong. Push transplanting too late and the bulb runs out of daylight hours before it can size up, which produces a crop of small onions from perfectly healthy plants. In long-day areas an early start is what produces the biggest bulbs, so the calendar deserves as much attention as the soil.

Soil, Spacing and Feeding

Drainage beats richness. Candy tolerates a fair range of soils as long as water moves through them, and the hybrid’s disease resistance covers a lot of beginner mistakes. Check pH before planting, since the target band of 6.0 to 6.8 is narrow enough to be worth a soil test. Organic matter dug in ahead of planting handles both drainage and feeding at once.

Spacing looks generous on paper and is not. Six inches between plants gives each bulb the room to reach that five to six inch diameter, and crowding is the usual reason a home crop comes out undersized. Rows at 24 inches leave space to hoe and to lay mulch without stepping on the shallow feeder roots.

A Worked Example for a 10-Foot Row

Arithmetic turns spacing into a shopping list. A 10 foot row at six inch spacing holds 20 plants, because 10 feet is 120 inches and 120 divided by six is 20. Three rows on 24 inch centers take up about four feet of bed width and hold 60 plants. Dixondale Farms sells Candy transplants in bunches of a minimum of 48 plants at $16.70 per bunch as of September 2026, so a 60 plant bed needs two bunches, roughly $33.40 before shipping, with spares left over to fill gaps where a transplant fails.

If I were growing Candy onions for the first time, I would choose transplants over seed. Seed costs less, but it demands a start 10 to 12 weeks before the last frost and adds a germination stage that can take up to two weeks. Transplants cost more, yet they remove that early hurdle and leave the gardener to focus on sun, soil, spacing, watering and feeding. For a beginner, that seems like the better trade because Candy already offers strong roots and disease resistance.

When and How to Harvest Candy Onions

Leaves tell you when. Once about half the green tops have slumped over and browned, the bulbs have stopped sizing and the crop is ready. Pick a dry stretch of weather if you can, because lifting onions out of wet soil invites the rots that show up weeks later in storage. Most gardens hit that point in late summer or early fall, though warmer regions sown in February or March can be pulling bulbs as early as June.

Lift, do not pull. Slide a spading fork under the row and ease the bulbs up, then lift each one by hand instead of yanking it out by the tops. Bruised tissue is an open door for bacterial infection, and damage done on harvest day is what shows up later as a soft brown patch under the skin. Handle them like eggs on the way to the curing rack.

Days to maturity give you a planning date, not a harvest date. Counting 85 to 100 days from planting gets you close enough to clear the calendar, then the tops make the actual call. Transplants from Dixondale Farms are quoted at 90 to 100 days, which sits inside that same window.

How to Cure and Store Candy Onions

Curing means drying the neck and the outer scales until nothing can get in, and it is the step that decides how long the crop lasts. Skipping it costs weeks of shelf life, and for a juicy sweet onion that margin is already thin.

Curing Step by Step

  1. Clean gently. Shake or wipe loose soil off the bulbs and leave the water hose alone. Soil left clinging feeds fungal problems such as Fusarium basal rot and Botrytis neck rot.
  2. Lay them out. Spread the onions one layer deep somewhere warm and well ventilated, 70 to 90 degrees Fahrenheit, out of rain and direct weather.
  3. Wait two to four weeks. Curing is done when the outer scales are dry and starting to peel and the necks have gone tight and papery.
  4. Trim. Cut the tops back to about one inch above the bulb, then trim the roots close.
  5. Sort. Set aside anything bruised, thick necked or soft, and eat those first. They will not keep.

Storage Temperatures and Shelf Life

Cool, dark and ventilated is the whole formula. Ideal conditions are 32 to 40 degrees Fahrenheit with 65 to 70 percent humidity, which is root cellar territory. Kitchens rarely offer that, so a pantry at 45 to 55 degrees in a mesh bag or an open woven basket is the realistic compromise. Airflow matters as much as temperature, and a sealed plastic bag will rot a good onion faster than a warm shelf will.

Storage Spot Temperature Humidity Realistic Shelf Life
Pantry or cupboard 45 to 55 degrees F Dry, ventilated Several weeks to a few months
Root cellar 32 to 40 degrees F 65 to 70 percent Several months
Refrigerator Cool and dry, breathable container Varies 2 to 3 months, texture softens
Freezer 0 degrees F or below Not applicable 6 to 8 months, blanched and chopped

Expect two to three months under good conditions and closer to four weeks in an ordinary warm pantry. Higher water content and thinner skin are what shorten the clock compared with a hard yellow storage onion, and no technique closes that gap entirely. One more rule worth following: keep onions away from potatoes, because gases coming off stored potatoes speed up onion deterioration.

Freezing changes the plan rather than extending it. Blanched and chopped onions keep six to eight months in airtight containers, but they thaw soft and belong in cooked dishes instead of anywhere they would be eaten raw. Freezing the tail end of a harvest before it turns is a sensible use of a crop that will not last the winter.

Cooking with Candy Onions

Raw Uses

Raw is where the variety justifies its price. Thin slices go into green salads, onto sandwiches and burgers, and through a salsa without the sulfurous bite that has people rinsing regular onion under cold water first. Pickling works especially well, since the sugar balances the vinegar and the result is a sweet, tangy condiment. Juiciness is the only caution, because a wet slice will soften bread if the sandwich sits.

Cooked Uses

Heat brings out a different character entirely. Slow sauteing or roasting turns the sugar savory and deep, which is why the variety suits caramelized glazes, stuffings and casseroles, and onions roasted alongside meat. Battered rings fry well. Stir-fries, soups and curries all take them, though much of the delicacy disappears in a long simmer, so a cheaper storage onion does that job just as well.

Where to Buy Candy Onions and What They Cost

Seed and transplants come from different kinds of supplier. Rohrer Seeds lists Candy onion seed, and Dixondale Farms ships bare-root plants in bunches of a minimum of 48 at $16.70 per bunch as of September 2026. Bunches go out of stock by mid-year, because transplants are a spring product with a short selling window, so ordering ahead of the season is the practical move.

Grocery shoppers face a different problem. Sweet onions on a produce shelf are usually labeled only as sweet onions, with the variety name left off entirely, so Candy rarely appears by name at retail. Asking at a farm stand in a growing region is the more reliable route, and the regions to ask in are Washington, California and Idaho.

If Your Candy Onions Still Go Soft or Sprout

Storage failures almost always trace back to a short list of causes: a wet harvest, a cure cut short, dirt left on the bulbs, storage that runs too warm or too damp, or onions kept next to potatoes. Most of them happen before the onion ever reaches the shelf.

  • Wet harvest. Bulbs lifted from soaked ground carry that moisture into the crate. Harvest in dry weather and delay a few days if rain is forecast.
  • Short cure. Two weeks is the minimum, not the target. Necks that still feel fleshy have not finished.
  • Dirt left on. Clinging soil carries the fungal spores behind basal rot and neck rot, so brush it off before curing rather than after.
  • Too warm or too damp. Anything above the 45 to 55 degree pantry band shortens shelf life sharply, and high humidity with poor airflow brings rot instead.
  • Stored with potatoes. Move them to separate shelves.

Bruises are the other common culprit, and they stay invisible for a while. A bulb dropped into a bucket or pulled up by its top can look perfect for weeks before a brown patch appears under the skin. Sorting at trim time catches most of them, and checking the crate every couple of weeks catches the rest before one bad onion takes its neighbors with it.

One honest limitation is worth stating plainly. Candy is not a keeper, and expecting a sweet, high-moisture onion to hold like a storage variety through winter is the most common disappointment with it. No amount of careful curing changes that. Plant a hard yellow storage variety alongside it if you want onions in February, and treat the Candy crop as the one you eat first.

Frequently Asked Questions

Are Candy Onions the Same as Vidalia Onions?

No. Vidalia is a certified regional product, and only growers in a defined part of Georgia may sell onions under that name. Candy is a hybrid variety with no geographic restriction, grown in Washington, California, Idaho and elsewhere. Taste trials put Candy almost as sweet as Vidalia and a shade milder.

Can You Eat Candy Onions Raw?

Yes, and raw is arguably the best use for them. Lower sulfur compounds and pyruvic acid mean the slices taste sweet rather than sharp, which suits salads, sandwiches and salsa. Under 5 percent pyruvic acid against 10 to 14 percent in a regular cooking onion is the measurable difference behind that.

How Long Do Candy Onions Take to Grow?

Plan on 85 to 100 days from planting to harvest, with transplant stock often quoted at 90 to 100 days. Seed started indoors adds another 10 to 12 weeks ahead of that. Watch the tops rather than the calendar, since the crop is ready when about half of them have fallen over and turned brown.

What Soil pH Do Candy Onions Need?

Aim for 6.0 to 6.8, slightly acidic to near neutral. Soil should drain freely and carry plenty of organic matter, and full sun is not optional for proper bulb formation. Test before planting, because amending the bed once the transplants are in is awkward and slow to take effect.

Can You Freeze Candy Onions?

Yes, with a caveat. Blanch and chop the onions first, then store them in airtight containers for six to eight months. Texture suffers in the freezer, so frozen Candy onions belong in soups, stews and other cooked dishes rather than anywhere they would be served raw.

Candy earns its place for gardeners who want a large, mild onion without fussing over daylight hours, and for cooks who want something pleasant raw that also caramelizes quickly. Treat the storage side realistically: cure properly, keep the bulbs cool, dark and ventilated, eat the bruised ones first, and plan on two to three months rather than a winter’s worth. Grow a hard storage variety next to it and the two together cover the year.

What This Page Does Not Publish

  • I do not cover pest or disease treatment here; use onion care advice suited to your garden.
  • I have not estimated harvest yields, which depend heavily on growing conditions and spacing.

References

Author Profile

Eric Dawson
Eric Dawson
I'm Eric Dawson, the writer behind The Money Watch. I live in the Columbus, Ohio area and I write about the ordinary questions that turn out to be complicated: computers, shopping, food, travel, parking, small businesses, fees, rules and products. Every article starts with the official page, the maker or the agency, then the sources that check it, and I say plainly where they disagree and what I would do. More about how I work is on the About page.