Onions Seeds or Sets: I’ve grown onions in many ways, including from sets and seeds. Growing onions from seed is the best method, I think. It lets you get the most out of your onion garden.
Key Takeaways
- Onion seeds are the most cost-effective way to grow onions1.
- Planting onion seeds allows for a wider variety of onion types, including long-day, short-day, and intermediate-day varieties21.
- Onion sets may be easier to plant, but they often produce smaller bulbs and have limited variety selection1.
- Growing onions from seed requires a bit more effort, but the resulting bulbs are typically larger and more flavorful21.
- Planting onion seeds via the winter sowing method can lead to earlier and larger bulb formation compared to indoor seed starting2.
Growing Onions: Seeds, Sets, or Transplants?
Gardeners have three main ways to grow onions: seeds, sets, or transplants. Each method has its own benefits and things to consider. Let’s look at the different options to help you pick the best one for your onion garden.
Exploring the Different Options for Planting Onions
Onion seeds give you a wide range of types to pick from3. They are less likely to bolt than sets3. But, they need more work for sowing, watering, and planting3. Seeds are also more prone to diseases than sets3.
Onion sets are easier to grow and need little effort3. They are less likely to get diseases than seeds3. Plus, they are ready to be picked earlier than seed-grown onions3. But, there are fewer types of onions you can get as sets3.
Onion transplants take about 10-12 weeks to grow4. Seeds are sown in late February or early March, and then planted outside in early May4. They should be spaced 4 inches apart in rows that are 6 to 36 inches wide4.
When picking your onion planting method, think about the onion type’s needs, your local climate, and what you want from your onions.
“Onions grow best in well-drained soil with a pH of 6.5 and require plenty of sunlight, regular watering, and raised beds for good soil drainage.”4
Raised beds for onions should be 4-6 inches high and filled with organic matter for the best growth4. Direct seeding onions is a good choice for some types and should be done when the soil can be worked, usually from mid to late March4.
Choosing onion seeds, sets, or transplants depends on their unique traits and needs. Knowing these will help you make the best choice for your garden and ensure a great onion harvest.
Benefits of Growing Onions from Seeds
Growing onions from seeds has many advantages over using onion sets. Planting smaller onion sets often results in larger bulb sizes compared to using larger sets, which tend to go to flower prematurely.5 Also, seeds let you choose from a wide variety of onions, unlike sets which are limited5.
Choosing to start onions from seed means you can pick from short-day, long-day, and day-neutral types6. This lets gardeners pick the best onions for their climate and soil. Short-day onions are perfect for southern and southwestern areas needing 10-12 hours of daylight to grow bulbs.5 On the other hand, long-day onions do well in northern regions, needing 13-16 hours of daylight to mature.5
Onion sets give a jump start on growth, leading to earlier and possibly bigger harvests. But, planting onion seeds often yields better overall results.5 Starting with seeds lets gardeners grow onions indoors or in trays before moving them outside. This method offers early growth and easier weed control.5

The choice between growing onions fromseeds or sets depends on the gardener’s goals, climate, and preferences. Knowing the benefits of each method helps gardeners make the best choice for their onion crops.
Choosing the Right Onion Variety for Your Region
Choosing the right onion variety is key for a great harvest7. Onions come in three types: short-day, long-day, and day-neutral. Knowing the differences helps you pick the best ones for your garden.
Short-day onions work well in southern areas, needing 10 hours of daylight to grow bulbs7. They grow fast, taking 110 days in the South in the fall and 75 days in the North in spring7. Long-day onions prefer the North, needing 14 to 15 hours of daylight to form bulbs7. They take 90 to 110 days to mature.
For gardeners in the mid-U.S., day-neutral onions are a top choice7. These onions grow well with 12 to 14 hours of daylight and taste sweet7. They take about 110 days to mature and are perfect for zones 5-6, excluding South Florida or South Texas7.
Think about your region and daylight hours when planning your onion garden8. Plant short-day onions in the fall for a late spring harvest, long-day onions in early spring, and day-neutral onions in the fall or early spring in the North8. Choosing the right onions ensures a big and tasty harvest.
| Onion Variety | Daylight Requirement | Maturity Timeline | Recommended Regions |
|---|---|---|---|
| Short-day | 10 hours | 110 days (South), 75 days (North) | Zones 7 and warmer |
| Long-day | 14-15 hours | 90-110 days | Northern regions (zone 6 and colder) |
| Day-neutral | 12-14 hours | 110 days | Zones 5-6 (excluding South Florida and South Texas) |
Selecting the right onion variety for your growing region is the key to a successful and bountiful onion harvest.
Understanding the differences between short-day, long-day, and day-neutral onions helps you choose the best for your garden789. With the right onions, you’ll enjoy a delicious and plentiful harvest.
Onion Planting Methods: Direct Sowing vs Indoor Seed Starting
Gardeners have two main ways to grow onions: direct sowing outside or starting seeds indoors under lights. Each method has its own benefits and things to consider.
Tips for Successfully Growing Onions from Seed
Onions need a long time to grow, often over 90 days. To get ahead, many start onion seeds indoors 10-12 weeks before moving them outside.10 This helps the seedlings grow strong roots and become ready for the garden.
But, it’s key to watch the light when starting onions indoors. Onions don’t like too much light too soon, or they might start forming bulbs too early.10 Finding the right light balance helps onions grow well before moving them outside.

For those who like a simpler method, direct sowing onion seeds in the garden works well.1112 It skips indoor starting and moving, making it easier. But, make sure to plant at the right time for your onion type11.
“Onions are shallow-rooted and prefer consistent moisture, showing why watering is key during growth.”10
Choosing indoor starting or direct sowing, paying close attention to onion seedlings and how to move them can lead to a great harvest.10 Knowing what onions need helps gardeners grow this tasty vegetable well.
The Convenience of Planting Onion Sets
Many gardeners choose to plant onion sets for their quick and easy nature13. These are partially-grown bulbs that can be put straight into the garden. This saves time and effort compared to starting from seed. But, the selection of onion types as sets is limited, and bigger sets might give smaller bulbs13.
Choosing between short-day, long-day, or intermediate-day onions is key based on your area’s climate13. This choice helps onions grow well. Also, onion sets need to develop roots before a hard freeze, usually in January for zone 7b13.
The timing of planting onion sets changes with the growing zone and area13. Getting the soil ready is crucial for onions, and adding compost gives them the nutrients they need13. You can prepare your garden beds in the fall for spring planting, making it easier for gardeners13.
| Onion Sets Advantages | Onion Sets Drawbacks |
|---|---|
|
|
In summary, planting onion sets is a convenient choice for many gardeners. It lets you pick the right day-length variety and grow onions faster13. But, there are fewer onion types to choose from, and bigger sets might give smaller bulbs13. The choice between onion sets and seeds depends on your gardening style and local conditions.

onions seeds or sets: Which is More Cost-Effective?
Choosing between onion seeds or sets affects your gardening budget. Growing onions from seed can save money over time.2
When picking onions, the variety matters. Seed offers dozens of choices, while sets have just a few.2 This means you can find the perfect onion for your climate and taste.
Onion seeds cost less than sets.3 But remember, seeds last only a year, so buy new ones each season.2 Sets can be used year after year.
| Factor | Onion Seeds | Onion Sets |
|---|---|---|
| Cost | Less expensive to purchase3 | More expensive to purchase |
| Variety | Dozens of varieties available2 | Limited range of varieties available3 |
| Reusability | New seed required each season | Can be reused year after year2 |
| Bulb Size | Tend to result in larger onions3 | Produce slightly smaller bulbs than those grown from seeds3 |
| Effort | More labor-intensive care and attention required3 | Easier to grow and require minimal effort3 |
Your choice between onion seeds or sets depends on your budget, space, and preferences. While sets are easier to plant, growing onions from seed offers more variety and bigger bulbs.23

Onion Growth Stages: From Seed to Maturity
Knowing how onions grow is key to a great onion harvest. Onions go through three main stages: the vegetative phase, the bulbing phase, and the flowering phase (which is for saving seeds)14. In the vegetative phase, onions grow 8-12 leaves14.
The bulbing phase starts when the days get shorter. Short-day onions start bulbing at 11-12 hours of sunlight a day, perfect for southern areas14. For central regions, intermediate-day onions start bulbing at 13-14 hours of sunlight14. Long-day onions need 15-16 hours of sunlight and are best in northern states14. Choosing the wrong type for your area can result in small bulbs or no bulbs at all14. Picking the right onion type is key for big bulbs14.
| Onion Variety | Bulbing Trigger | Recommended Region |
|---|---|---|
| Short-day | 11-12 hours of daylight | Southern states |
| Intermediate-day | 13-14 hours of daylight | Central regions |
| Long-day | 15-16 hours of daylight | Northern states |
Onions take about 90 to 100 days to grow from seed, or around four months15. They are usually started two months before the last frost, which is in March15. Big onions start from seeds for a harvest in the same year. Small onions can be planted directly in the ground15.

Understanding onion growth helps gardeners plan better. This ensures a great onion harvest.
Troubleshooting Common Onion Growing Challenges
Onions are usually easy to grow, but gardeners might face some issues. Pests, diseases, soil problems, and wrong watering or fertilizing can happen. It’s key to watch your onions closely and fix problems fast to keep them healthy and boost your harvest16.
Pink root is a common issue, a fungus that spreads in the soil. It makes leaves turn brown from the top and roots change color, cutting down on your harvest17. Downy mildew, a mold, also worries gardeners, especially in damp weather. It turns leaves gray to purple, causing spots and wilting stalks17.
Onion maggots are another pest, a fly larva that burrows into bulbs. This can make leaves turn yellow and wilt, and even kill the plant17. Nematodes, tiny worms, can also harm onions, making leaves yellow, stunting growth, and swelling bulbs at the base17.
Onions need the right nutrients to grow well. Lack of phosphorus or potassium can make bulbs thick and plants small17. Botrytis rot, a fungal disease, turns the bulb’s neck soft and moldy, with gray or brown spots17.
To beat these problems, keep an eye on your onions, rotate crops, and remove sick plants right away. Good soil, watering, and fertilizing can also prevent many issues161817.

By being alert and fixing problems fast, you can have a great onion harvest in your garden161817.
Harvesting and Storing Onions Properly
Harvesting and storing onions right is key to a big and lasting onion harvest. It’s important to pull onions up when their tops fall over and half the leaves dry and die back19. Then, cure them for two to four weeks in a shaded, well-ventilated spot19.
Curing makes the onion skins tough, dries the necks, and brings out the full flavor and storage potential19. Pungent onions like Candy, Copra, Red Weathersfield, and Ebenezer have tighter skins. They sting your eyes when chopped but are great for storage because they don’t rot easily19.
After curing, keep onions in a cool, dry place with good air flow, ideally between 35 to 40 degrees Fahrenheit19. If stored right, these onions can last 10 to 12 months. But mild onions like Spanish, Bermuda, Vidalia, and Walla Walla Sweet should be eaten within weeks because they don’t keep as long19.
For storage, use mesh bags, bushel baskets, orchard racks, or flat cardboard boxes with holes for air19. Don’t store onions with apples or pears because their gas can make onions spoil faster20.

By following these tips for harvesting and storing onions, gardeners can have a steady supply of this versatile vegetable all year192021.
Ensuring a Bountiful and Long-Lasting Harvest
Harvesting and storing onions right is key to a big and lasting harvest. The right harvest time, curing, and storage conditions are crucial for a successful onion garden192021.
| Onion Type | Recommended Storage Duration |
|---|---|
| Pungent Onions (Candy, Copra, Red Weathersfield, Ebenezer) | 10-12 months |
| Mild Onions (Spanish, Bermuda, Vidalia, Walla Walla Sweet) | 2-3 months |
“Properly cured and stored storage onions can retain their eating quality for 10 to 12 months, while mild onions should be consumed within a few weeks.”19
Companion Planting: Best Neighbors for Your Onion Patch
Onions are a key part of any garden, and they get even better with the right plant friends. By picking plants that work well together, gardeners can make their onion patch pest-free, fertile, and healthier22.
There are many onion companion plants to choose from. Beets, spinach, alliums, and more can help your onions grow strong22.
Onions keep pests away from other plants, like tomatoes and peppers22. Marigolds, for example, keep nematodes away from onions and garlic22. Plus, onions can grow in containers, perfect for small gardens22.
When planning your onion garden layout, think about what each plant offers. Carrots and onions work well together, but it depends on the pest you’re fighting23. Onions also protect cabbage family plants from pests23.
Using onion pest management strategies with other plants is smart. Mint and parsley confuse onion flies, while chamomile makes onions taste better23. Onions also keep aphids and beetles away from tomatoes23.
To prevent onion disease, pair onions with alliums and chives to keep aphids away from roses23. Onions also protect tomatoes and peppers from pests23.
Companion planting makes onions stronger and healthier. With the right plan, your onion garden will thrive2223.

Winter Sowing: An Easy Method for Growing Onions from Seed
Discover the ease of winter sowing for growing onions. This method lets you start seeds outside in the cold winter. It saves energy by avoiding indoor seed starting under grow lights2425.
Embracing the Power of Nature for Effortless Onion Cultivation
Winter sowing is easy and saves money. It uses the natural seasons to help your onions grow. By sowing seeds in outdoor containers in winter, you get strong seedlings ready for your garden25.
This method is great because it’s easy and flexible. You can use containers like milk jugs or soda bottles25. These containers help your seeds germinate and grow well25.
- Prepare your containers by making holes for drainage and ventilation25.
- Fill the containers with good potting soil and plant your onion seeds as the package says25.
- Mark your containers and put them in a sunny spot outside25.
- Check on them often, keeping the soil just right, and watch your onions grow25.
Winter sowing saves money by cutting down on indoor seed starting costs25. It’s also great for growing many cold-hardy vegetables, like onions25.
Try winter sowing for easy onion growing242526.
| Onion Variety | Daylight Requirements | Best Suited Regions |
|---|---|---|
| Short-day | 10-12 hours | Southern states |
| Long-day | 14-16 hours | Northern US and Canada |
| Intermediate-day | 12-14 hours | Central US |

“Onion seeds can be sown in containers outside in the northern part of the country when the outside temperature consistently remains below 40°, usually any time after early December and January.”24
Winter sowing makes growing onions easy, even in cold places. It’s eco-friendly and saves money. This method uses nature to help onions grow well, perfect for all gardeners242526.
Succession Planting: Extending Your Onion Harvest
Learning how to plant onions in succession can greatly extend your harvest and keep onions coming all season27. By planting onions at different times, you can have fresh onions from midsummer to the next spring27.
Plan your onion planting carefully. Don’t plant all your onions at once. Instead, plant them in several batches a few weeks apart. This way, you’ll have onions to enjoy from midsummer to the next spring27.
Onions come in many types, making them perfect for succession planting. Scallions can be planted often for a steady supply. Bulbing onions and leeks give you onions for a longer time27. Even walking onions can be part of your plan, adding variety to your cooking27.
To get the most from your onions, combine succession planting with other ways to extend the season28. Plant onions with other crops, use cold frames or row covers, and rotate your crops for a healthy onion patch28.

Onion succession planting means you always have onions on hand. With some planning and trying new things, you can enjoy onions all year. This adds flavor and nutrition to your meals29.
| Crop | Succession Planting Opportunities |
|---|---|
| Scallions | Can be planted multiple times throughout the growing season for a continuous harvest |
| Bulbing Onions | Long-season crops that can be harvested from midsummer through the following spring if properly cured and stored |
| Leeks | Very long-season crops, typically planted for fall harvest and used throughout fall and into winter |
| Walking Onions | A perennial plant that offers a variety of crops which can be harvested from spring through fall |
Onion Garden Maintenance: Keeping Your Crop Healthy
Keeping your onion garden healthy takes careful attention and management. You need to prepare the soil well, transplant at the right time, control weeds, and keep the soil moist. These steps help your onion plants grow strong and produce well. By focusing on these tasks, you can look forward to a great onion harvest.
Preparing the Onion Bed
Start by getting your onion garden bed ready. Make sure the soil is soft, rich, and has a pH between 6.0 and 6.5. Onions love nutrients and may do well with manure as they grow.30 Add compost or organic matter to the soil to help with drainage and nutrients.
Transplanting Onion Seedlings
When it’s time to move your onion seedlings, handle them carefully. Plant them half an inch deep, about 4 to 6 inches apart in the prepared soil31. This way, they’ll grow well and get good air around them. Onion seedlings should be planted half an inch deep, 4 to 6 inches apart in fertile soil with a pH of 6 to 6.5.31
Controlling Weeds and Pests
It’s important to keep your onion garden weed-free. Pull weeds by hand or with a hoe, being careful not to harm the onions. Also, protect your onions from pests like onion maggots and thrips.32
Irrigation and Fertilization
Onions need steady moisture all season. Water your garden with at least 1 inch of water a week, adjusting as needed31. Onions grow better from seeds than sets, avoiding disease, storing well, and bulking up quicker.31 Use a balanced fertilizer or manure to feed them well.

By using these tips for onion garden care, you’re on your way to a great harvest. Tailor your care to your onion types and your garden’s conditions for the best results.
Conclusion: Unlocking the Potential of Your Onion Garden
Starting your onion garden with onion seeds or onion sets has its perks. Knowing the differences between them helps you make the most of your garden. This way, you can enjoy a great harvest33.
Creating a well-thought-out onion garden leads to success in onion growing and onion cultivation. Choosing the right onion varieties and planning your garden are key steps. Each action helps make your onion production better33.
This guide has shared a lot of useful info and tips for onion gardening. Whether you start with seeds or sets, being flexible is important. By doing so, you can grow a successful onion garden. This garden will give you plenty of tasty onions every year34.
FAQ
What are the key differences between growing onions from seeds versus sets?
Growing onions from seeds gives you more types of onions and bigger bulbs. It’s also cheaper. But, starting with seeds takes more time and effort.
What are the advantages and disadvantages of the different onion planting methods (seeds, sets, or transplants)?
Seeds offer lots of variety and save money but need more work. Sets are easy but have fewer choices. Transplants start strong but cost more.
Why is growing onions from seed considered the superior method compared to using onion sets?
Seeds give you bigger bulbs and more variety. They’re also cheaper over time, even with the extra work.
How do I choose the right onion variety for my growing region?
Onions need different lengths of daylight to grow. Pick the right type for your area for the best results.
What are the recommended techniques for successfully growing onions from seed?
Start seeds indoors under lights and move them outside later. Managing the light and moving them carefully helps them grow well.
What are the advantages and drawbacks of using onion sets for planting?
Sets are easy to find and use but give fewer varieties and sometimes smaller bulbs than seeds.
Is it more cost-effective to grow onions from seed or use sets?
Seeds are cheaper in the long run, thanks to more varieties. But, starting with seeds costs more upfront than sets.
What are the different stages of onion growth and development?
Onions go through germination, leaf and root growth, and bulb formation. Knowing this helps with the right care and timing.
What are some common challenges in growing onions, and how can they be addressed?
Growers face pests, diseases, nutrient issues, and watering mistakes. Watch closely and act fast to keep plants healthy and increase your yield.
How do I properly harvest and store onions for long-term use?
Harvest at the right time and cure onions well for a good harvest. Keep them in a cool, dry place to stay fresh.
