8 Best Days to Plant Onions: Top Onion Seeds and Sets for 2026

KVITER's Walla Walla onion seeds are a solid pick for home gardeners who want a dependable, sweet long day variety. Packed with 500 seeds, this heirloom, non GMO packet is aimed at growers in USDA zones 2-9 who can offer full sun and the 14-15 hours of daylight needed for proper bulb formation. The seeds are also suitable for starting indoors, giving northern gardeners a head start before the last frost.

What stands out most is the germination speed. Many users report seeing sprouts in just over a week, which is reassuring for a crop that can feel slow to start. The Walla Walla onion is known for its mild, sweet flavor, and the description backs that up by noting it matures earlier than many other long day onions. That means you can enjoy fresh green stems early in the season and full bulbs by summer.

Seeds come in a standard foil pack with basic planting instructions. There are no fancy extras, but the quantity is generous for the price. The variety is open-pollinated, so you can save seeds for future seasons if you isolate plants. As a long day onion, it is best suited to the northern half of the US; gardeners in southern states may see fewer or smaller bulbs. Also, spacing really matters pack seeds too close and you will get stunted growth.

To sum it up, these seeds deliver what you expect from a classic sweet onion variety. They are reliable, fairly easy to grow, and produce a tasty crop. The main limitation is the daylight requirement, but if you live in a suitable zone and follow basic planting guidelines, the KVITER Walla Walla seeds are a worthwhile investment for your garden.

The TomorrowSeeds 3 Colors Mix Onion Sets offer gardeners a convenient way to grow a trio of onion varieties from a single purchase. This set includes Yellow Stuttgarter, Red Karmen, and Snowball White onions, each bringing its own flavor profile and color to the garden. Whether you are a seasoned grower or just starting out, these onion sets are designed to be easy to plant and care for, making them a solid choice for anyone looking to add homegrown onions to their harvest.

What sets this product apart is the mix of intermediate day onions, which perform well in a broad range of climates and day lengths. Customers report that the bulbs sprout quickly, often within a week, and produce vigorous growth. Many reviewers mention receiving over 100 bulbs in their order, offering excellent value for the price. The onions are suitable for both fresh eating and long-term storage, with the Yellow Stuttgarter variety known for its excellent keeping qualities.

In terms of quality, the bulbs are generally described as healthy and firm, though a few customers have noted some soft or moldy specimens. The packaging is compact and the sets arrive ready to plant. The color mix adds visual interest to garden beds, and the different flavors allow for culinary versatility from crisp red onions in salads to sweet whites in salsas.

One potential drawback is that the distribution of colors may not be perfectly equal, with some customers receiving more white and red onions than yellow. Additionally, while most bulbs sprout well, a small percentage may be too soft to use. However, the overall germination rate appears high based on feedback.

Overall, the TomorrowSeeds 3 Colors Mix Onion Sets are a reliable and cost-effective way to grow a diverse onion harvest. They are especially suited for gardeners in USDA zones 2 and above who want a simple, rewarding project. With proper care, these sets can provide a bountiful supply of flavorful onions for months.

The Mixed Onion Assortment from Stargazer Perennials is a practical choice for home gardeners who want a reliable supply of red, white, and yellow onions. This 8-ounce pack contains roughly 50 to 60 hand-sorted, non-GMO onion sets grown naturally in the USA. It's designed for gardeners in zones 3 through 10, making it a versatile option for most regions. Whether you're a seasoned grower or just starting out, the included planting guide helps you get started right away.

The standout feature here is the mix of three onion colors, which adds variety to your meals and garden. The sets are suitable for both short-day and long-day conditions, so they adapt well to different latitudes. Many buyers report high germination rates and fast growth, with some noting that the pack actually contains more than 50 bulbs. You can harvest them young for salads or let them mature into full-size onions for storage. The ability to plant in garden beds, raised planters, or even containers indoors adds to their appeal.

In terms of build quality, the bulbs are generally healthy and firm upon arrival, though a small number of customers have received dried-out or papery bulbs. The packaging is recyclable and the sets are shipped year-round, which is convenient for planning your planting schedule. The brand's commitment to chemical-free growing and bee-friendly practices is a nice bonus for eco-conscious gardeners.

On the downside, some users experienced variable yields, and a few found that a portion of the bulbs didn't sprout. Additionally, the product cannot be shipped to Idaho or Washington. Overall, this onion set mix offers good value for the price, especially if you want a diverse harvest without buying multiple varieties separately. It's a solid choice for any home gardener looking to grow their own onions with minimal fuss.

The Stargazer Perennials Non-GMO Onion Sets offer a smart solution for home gardeners who want a reliable harvest of fresh onions. This 8 ounce pack includes a mix of red, white, and yellow bulbs, giving you three different flavors and storage qualities in one purchase. The sets are naturally grown in Oregon, hand-sorted before packing, and come with a simple planting guide that makes it easy to get started. Whether you're a seasoned grower or trying onions for the first time, this product is designed to deliver results.

Standout features include the high germination rate, as noted by many verified buyers. Several gardeners reported 100% germination and strong, healthy growth. The bulbs can be planted in the garden, raised beds, or containers, and you can harvest them early as green onions or let them mature into full-sized bulbs. Customers also appreciate the non-GMO guarantee and the care taken in packaging, with bulbs shipped fresh from the farm in recyclable materials. The variety in the mix means you get mild and robust flavors that work well in salads, stir-fries, or long-term storage.

In terms of build and quality, each box contains around 30 to 60 bulbs depending on size. The sets are firm and viable on arrival, though a few customers mentioned occasional squishy bulbs. This is a minor issue, and most reported the unaffected bulbs still grew fine. The planting guide is clear and covers timing, spacing, and care, which helps avoid common mistakes. The company's farm is certified pest-free and bee-friendly, adding to the appeal for eco-conscious gardeners.

Potential drawbacks come mainly from logistics and timing. A few buyers found the shipping cost steep relative to the $9.25 price, and some felt the bulbs were too small for the price. Late planting or poor soil conditions can also lead to smaller onions, so following the included guide is important. A couple of negative reviews mentioned mold or dead bulbs, but these appear to be exceptions rather than the rule. Overall, the majority of feedback is positive, with customers praising the taste, germination, and storage life.

Verdict: If you're looking for a reliable, non-GMO onion set that offers variety and ease of growth, Stargazer Perennials delivers. The high germination rate, included planting instructions, and flexibility to grow indoors or outdoors make it a strong choice. Just keep an eye on shipping costs and plant at the right time for your zone. With proper care, you'll enjoy a bountiful harvest of fresh onions for months.

The Seed Needs Walla Walla Onion Seeds offer a reliable way to grow one of the sweetest onion varieties right in your northern garden. Bred for long-day conditions, these heirloom seeds produce large, globe-shaped bulbs with light brown skin and crisp white flesh. Perfect for gardeners in cooler climates, this variety can withstand cold temperatures and still yield impressive 2-pound onions.

Standout features include the seeds' non-GMO heritage and untreated status. Seed Needs packages them in tear-resistant, moisture-proof packets with full growing instructions on the back. The inclusion of a QR code makes reordering simple. With 450 seeds per pack, you have plenty for successive sowings or sharing with fellow gardeners.

In real-world performance, Walla Walla onions excel when started indoors 8-12 weeks before the last frost. They need full sun, consistent moisture, and fertile, loose soil. Germination typically takes 7-14 days, and plants grow 20-24 inches tall. The bulbs reach 4-6 inches in diameter and weigh 1-2 pounds. Keep in mind that these onions do not store well, so plan to use them fresh or lightly cook them for the best flavor.

The main drawback is their sensitivity to storage conditions. Unlike some storage onions, Walla Wallas are best consumed within a few weeks of harvest. They also require careful watering and well-draining soil to prevent rot. Southern gardeners will find them less suitable due to the long-day requirement.

Overall, Seed Needs delivers a quality product that matches its description. If you live in a northern region and love sweet onions, this pack is a solid investment. The seeds are fresh, the price is fair, and the growing guidance is clear. You can expect a bountiful harvest with proper care.

Brand: Seed Needs

Plant Type: Vegetable (Onion)

Variety: Walla Walla (Long Day)

USDA Hardiness Zones: 2-10

Sunlight: Full Sun

Soil Type: Fertile, rich, loose, free of gravel

Moisture Needs: Regular watering (about 1 inch per week)

Indoor/Outdoor Usage: Indoor (start seeds) then outdoor

Expected Plant Height: 20 inches (tops)

Seed Count: 450 seeds per packet

Material Features: Non-GMO, Heirloom, Untreated

Packaging: Tear-resistant, moisture-proof packet with growing instructions

The Sow Right Seeds Short Day Onion Collection is a thoughtful bundle for anyone wanting to grow onions from seed. It includes three popular short-day varieties: Red Creole, Crystal White Wax, and Texas Early Grano. These onions are best suited for gardeners in southern regions where days are shorter, but they can also be grown in other areas with proper timing. The collection is especially appealing to home gardeners who value non-GMO, heirloom seeds and want a reliable start to their vegetable patch.

Performance is where this product shines. Customer reviews consistently praise the high germination rate, with many reporting sprouts within just a few days. One reviewer noted that 40 out of 50 seeds germinated in a mixed tray, while another saw sprouts in four days. The seeds are packed with at least 500mg per variety, giving you plenty to work with. The instructions on each packet are clear and straightforward, making it easy for beginners to get started. Sow Right Seeds also backs their product with a promise to replace seeds that don't germinate, which adds peace of mind.

In terms of quality, these seeds are non-GMO and heirloom, meaning you can save seeds from your harvest for future plantings. The company operates on solar power and has taken the Safe Seed Pledge, so you're supporting sustainable agriculture. The packets themselves are large and premium, with attractive labeling that makes them easy to store and identify. However, the packaging is designed for outdoor use, so plan accordingly if you want to start seeds indoors.

There are a couple of potential drawbacks to consider. One reviewer with over a decade of gardening experience reported a low germination rate and said they wouldn't buy again. This highlights that results can vary based on soil, climate, and care. Additionally, because these are short-day onions, they may not perform well in northern gardens with long summer days. Some customers also noted that growth can be slow, especially in cooler weather, so patience is key.

Overall, the Sow Right Seeds Short Day Onion Collection is a reliable and affordable option for home gardeners who want to grow their own onions. The high germination rate, variety of types, and sustainable practices make it a solid buy. If you're in a suitable growing zone and follow the instructions, you'll likely enjoy a bountiful harvest of fresh, flavorful onions.

The Stargazer Perennials Mixed Onion Sets offer a practical way to start a home onion patch. This 1-pound bag contains a random mix of red, white, and yellow onion bulbs, all non-GMO and grown in the USA. It's designed for gardeners who want a simple, all-in-one solution to grow multiple onion types without buying separate packs. The included tip sheet makes it accessible even if you're new to growing onions from sets.

What stands out is the variety. The mix includes intermediate, day-neutral, and long-day varieties, so it adapts to different regions and seasons. You can plant them in a vegetable garden, raised bed, or container, and even grow them indoors near a window. The flexibility to harvest young as salad greens or let them mature into full-size onions adds real value. Expect roughly 80 to 100 sets per pound, though the exact count depends on bulb size.

In terms of quality, the bulbs arrive hand-sorted and ready to plant. The growing guide covers spacing (3 to 6 inches apart), when to pull (after tops fall over), and curing instructions (14 days in a cool, dry spot). This attention to detail helps ensure a successful harvest. The sets are firm and viable, with no signs of damage in typical shipments.

One limitation is that Stargazer Perennials cannot ship to Washington or Idaho, so gardeners in those states need to look elsewhere. Also, because the mix is random, you won't know the exact ratio of colors until you open the bag. Some users might prefer a more predictable assortment. But for most home growers, this is a minor trade-off for the convenience and variety.

Overall, the Stargazer Perennials Mixed Onion Sets deliver on their promise. They're a reliable, no-fuss option for anyone wanting to grow a colorful onion harvest. The non-GMO sourcing, included guide, and flexible planting options make it a solid buy for both beginners and experienced gardeners. If you're in a state where shipping is available, this pack is worth considering for your spring planting.

The TomorrowSeeds Super Sweet Candy Onion Sets are a fantastic choice for home gardeners who want a reliable, mild-tasting onion. These Vidalia-type bulbs are intermediate day neutral, meaning they grow well in most U.S. regions without issues. Whether you're a seasoned grower or a beginner, these sets offer an easy entry into onion cultivation, with the promise of both green onions early on and full-sized bulbs for storage later.

One standout feature is the flavor: these onions are genuinely sweet and mild, perfect for fresh use in salads, sandwiches, or salsas. They also excel when grilled or caramelized, bringing out a rich, tender sweetness. Many customers note that the bulbs arrived in good condition and sprouted quickly, with high germination rates. The bulbs produce large, uniform rounds with golden-brown skin and crisp white flesh.

In terms of design and build quality, the product consists of small starter bulbs that are ready to plant. They are straightforward to handle, with no special preparation needed. However, packaging and shipping can be hit or miss. Some buyers reported receiving bulbs that were shriveled, rotten, or already sprouted, which impacted plantability. This seems to be a quality control issue, though most orders appear to be in fine shape.

Storage performance is a major plus. When cured properly, these onions can last for months without losing their texture or sweetness, a feature prized by those who like to grow their own pantry staples. The early maturity means you won't wait long for your first harvest, which adds to the appeal for impatient gardeners.

Overall, the TomorrowSeeds Super Sweet Candy Onion Sets deliver on flavor and ease of growth. While occasional quality issues with individual bulbs may occur, the majority of users are satisfied. This product is best for anyone wanting a dependable, sweet onion variety for fresh eating, cooking, and long-term storage. A solid choice for the 2026 growing season.