Nothing frustrates a home gardener more than dropping a handful of promising bulbs into the soil only to watch half of them rot or wither. The difference between a full harvest and a sad patch of dirt often comes down to what you put in the ground in the first place — fresh sets or high-germination seeds from a reliable source.
I’m Mohammad Maruf — the founder and writer behind Gardening Beyond. I spend my time comparing variety counts, analyzing germination rates from verified buyer reports, and cross-referencing hardiness zones with optimal planting windows so you don’t have to.
Whether you are sowing in raised beds, containers, or a traditional plot, the right choice depends on your climate, space, and how quickly you want results. This guide breaks down the five strongest options available this season for finding the best onion seeds for planting, ranked by viability and value.
How To Choose The Best Onion Seeds For Planting
Onions are one of the most rewarding crops for home gardeners, but success depends on matching the right seed or set type to your region’s daylight conditions and your personal timeline. The wrong variety can produce tiny bulbs or fail to bulb at all.
Day-Length Classification: Short, Intermediate, or Long
Onions form bulbs in response to daylight hours. Northern growers (zones 5 and below) need long-day varieties that bulb when days reach 14-16 hours. Southern growers (zones 8 and above) should pick short-day types that start bulbing at 10-12 hours. Intermediate or day-neutral varieties are the safest bet for most gardeners and work well in zones 5-7.
Sets vs Seeds: Speed vs Variety
Onion sets (small dormant bulbs) give you a head start of weeks and are more forgiving for beginners, but they offer fewer variety options. Seeds provide access to heirloom, bunching, and specialty cultivars at a much lower cost per plant, though they require indoor starting or careful soil preparation.
Germination Rate and Freshness
Seeds lose viability quickly — a pack labeled for the previous year may drop below 50% germination. Look for recent sell-by dates and check verified buyer photos in the review section. For sets, plump, firm bulbs with no soft spots indicate high viability.
Quick Comparison
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| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| Tokyo Long White Bunching Onion | Seed Mass | High-volume bunching harvests | ~33,600 seeds per 4 oz | Amazon |
| Mixed Onion Assortment Sets | Set Mix | Ready-to-plant mixed varieties | 40-60 sets per 8 oz | Amazon |
| White Onion Sets | Single Variety | Mild white onions for salsa | Maturity in 80 days | Amazon |
| 3500+ Long Green Scallion Seeds | Bunching Seeds | Continuous scallion harvesting | 3500 seeds per pack | Amazon |
| B&KM Farms Survival Seed Kit | Multi-Variety Vault | Emergency food garden setup | 30 varieties, 20,000+ seeds | Amazon |
In‑Depth Reviews
1. Tokyo Long White Bunching Onion Garden Seeds
The Mountain Valley Seed Company offering delivers an enormous seed count — roughly 33,600 seeds in a 4-ounce bag — making it one of the most cost-efficient options for gardeners who want to plant bunching onions in bulk. As an open-pollinated heirloom variety, Tokyo Long White is winter-hardy and can be harvested as scallions at 65 days or left to mature fully at 100 days.
Customer reports confirm high germination rates in most conditions, though a minority of buyers noted lower-than-expected sprouting, which may be related to seed age or soil temperature. The variety is an annual and not intended to overwinter, so plan spring or late-summer sowing accordingly.
The bag is generously filled, but storage matters — keep it cool and dry after opening to preserve viability across multiple seasons. If you have the space and want a single purchase to supply scallions for years, this is the strongest pick.
What works
- Massive seed count at a low per-seed cost
- Heirloom, open-pollinated genetics for seed saving
- Flexible harvest window from 65 to 100 days
What doesn’t
- Occasional inconsistent germination reported by some buyers
- Not suited for bulbing — it’s a bunching variety
2. Mixed Onion Assortment 50 Plus Count Sets
Stargazer Perennials sends an 8-ounce bag of mixed onion sets that includes red, white, and yellow varieties, combining short-day, day-neutral, and long-day types so gardeners in almost any zone can find success. The hand-sorted bulbs typically run between 40 and 60 per order, and the included tip sheet helps beginners get them in the ground correctly.
Verified buyers report a near-100% sprout rate in most cases, with bulbs arriving plump and firm rather than dried-out husks. A small percentage of orders contained a few unusable bulbs, but the overwhelming majority of reviews praise the size and freshness of the sets.
This mix works well in raised beds, containers, or traditional rows. You can harvest young greens early and let the rest mature into full-sized bulbs. It is the simplest path to a multi-color onion harvest without managing multiple seed packets.
What works
- Immediate planting with no indoor starting needed
- Three color varieties in one bag for garden diversity
- Excellent germination rate in buyer reviews
What doesn’t
- A few dried-out bulbs occasionally slip through quality control
- Cannot ship to Idaho or Washington state
3. White Onion Sets for Planting
Smoke Camp Crafts delivers a focused single-variety set of white onions, chosen for their mild, crisp flesh that works perfectly in raw applications like salsa and salads. The bulbs arrive in a 10-ounce package with uniform sizing, making spacing predictable at 12-15 inches apart.
The 80-day maturity window is straightforward, and the plants are hardy down to 25°F, which gives a generous planting window in spring and early fall. Deer resistance is a real advantage for gardens near wooded areas — rabbits and other small animals also tend to leave these alone.
Buyers consistently highlight the careful packaging and natural materials used for shipping. A very small number of sets failed to sprout, but the overall viability sits well above typical local nursery stock. If you want a single color and the mildest flavor profile, this set is a reliable choice.
What works
- Uniform bulb size for even spacing and harvest
- Deer resistant, ideal for rural or suburban plots
- Careful eco-friendly packaging protects bulbs in transit
What doesn’t
- A few non-sprouting bulbs reported in some orders
- Single white variety limits color diversity in the garden
4. 3500+ Long Green Scallion Seeds
Apexmode packages these bunching onion seeds as a winter-hardy selection that gardeners across Florida to the Northeast have reported growing well. The non-GMO, organic, heirloom designation means you can save seeds from your healthiest plants for subsequent seasons without quality loss.
Some buyers expressed disappointment about seed count, with one weighing the bag and estimating roughly 2,425 seeds instead of the advertised 3,500. Germination has been strong for most users, with many reporting nearly full sprout rates even in Florida’s challenging soil conditions.
This is a good option if you want a massive scallion patch from a single purchase and are comfortable accepting that the seed count may be lower than stated. The winter-hardy nature allows for extended growing seasons in mild climates.
What works
- Strong germination even in tough southern climates
- Organic, heirloom seeds suitable for seed saving
- Winter-hardy for extended or overwinter production
What doesn’t
- Seed count appears lower than the advertised 3,500
- Poor germination reported by a subset of buyers
5. B&KM Farms 20,000+ Survival Seed Kit
B&KM Farms positions this kit as both a survival staple and a gardener’s variety pack, containing 30 different fruit and vegetable varieties sealed in a weather-proof plastic pail. Onion seeds are included among the mix, making this a convenient option for preppers or anyone starting a full kitchen garden from scratch.
The resealable Mylar packets inside maintain freshness beyond the printed sell-by date of late 2028, and many buyers report germination rates around 90% across the included varieties. The addition of garden markers and a digital growing guide removes guesswork for beginners who might be overwhelmed by 30 different plant types.
This is not the right choice if you only need onions — you will pay for many varieties you may not grow immediately. But if you want a one-stop seed bank that covers onions along with tomatoes, peppers, and other staples, the value is undeniable.
What works
- High germination rate across all tested varieties
- Long-term storage container with resealable packets
- Comprehensive variety ideal for emergency or new gardens
What doesn’t
- Not onion-specific — bundled with 29 other varieties
- Heavier package, less portable than a seed bag
Hardware & Specs Guide
Germination Rate & Freshness Dating
The single most reliable indicator of seed quality is the sell-by or pack-by date printed on the bag. Onion seeds typically remain viable for 2-3 years when stored in cool, dry conditions, but germination drops sharply after year one. Sets (dormant bulbs) are less dependent on dating — look for firm, plump bulbs without soft spots or mold.
Day-Length Matching
Onion varieties are classified as short-day (10-12 hours), day-neutral (12-14 hours), or long-day (14-16 hours). Planting the wrong type for your latitude results in tiny bulbs or tops that never bulb at all. If you are unsure, day-neutral varieties like those in the Stargazer Perennials mix are the safest choice for most U.S. gardens.
FAQ
Can I plant onion seeds directly in the ground or should I start them indoors?
How many onion seeds should I plant per square foot?
What does “day-neutral” mean for onion seeds?
How long do onion seeds stay viable in storage?
Final Thoughts: The Verdict
For most gardeners, the best onion seeds for planting winner is the Tokyo Long White Bunching Onion Seeds because it delivers an unmatched seed count per dollar with reliable heirloom genetics and a flexible harvest window. If you want instant results without indoor starting, grab the Mixed Onion Assortment Sets. And for anyone building a full food garden from scratch, nothing beats the variety and storage quality of the B&KM Farms Survival Seed Kit.