Choosing the right heirloom onion plants means looking beyond the grocery store and picking varieties with deep flavor, proven hardiness, and the ability to store well into the winter. Whether you are after a sweet German shallot or a perennial Egyptian walking onion that multiplies on its own, the bulb quality and variety type determine your harvest success more than any other factor.
I’m Mohammad Maruf — the founder and writer behind Gardening Beyond. I spend my time comparing seed-stock genetics, analyzing USDA hardiness zone data, and studying grower feedback to find the most reliable heirloom sets for home gardens.
This guide breaks down the top-rated bulb sets and bulbil options available right now, so you can confidently pick the best heirloom onion plants for your region and growing style without sorting through dozens of inconsistent listings.
How To Choose The Best Heirloom Onion Plants
Heirloom onion varieties offer richer flavor and better genetic diversity than modern hybrids, but picking the wrong type for your latitude can result in tiny bulbs or premature bolting. Focus on three factors: day-length adaptation, set size, and storage potential.
Day-Length Classification Is Not Optional
Onions bulb based on daylight hours. Long-day varieties (14–16 hours) thrive in northern zones (USDA 3–6), while short-day types (10–12 hours) are best for southern zones (USDA 7–10). Intermediate-day onions handle middle latitudes. Most heirloom sets in this guide use intermediate-day genetics, which work for the widest range of home gardens.
Set Size Determines Harvest Speed
Larger sets (¾-inch diameter) produce thick green tops quickly and earlier dry bulbs, but they have a higher risk of bolting if temperatures fluctuate. Smaller sets (½-inch diameter) are slower to start but often yield larger final bulbs with better storage life. The ideal size depends on whether you want early scallions or large storage onions.
Perennial vs. Annual Growing Habit
True perennial heirlooms like Egyptian Walking Onions produce bulbils at the top of the stalk instead of a single large bulb. These self-propagate year after year without replanting, making them excellent for permaculture beds. Standard annual sets like Stuttgarter or Red Burgundy produce one bulb per set and need to be replanted each season.
Quick Comparison
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| Model | Category | Best For | Key Spec | Amazon |
|---|---|---|---|---|
| Stargazer Perennials Mixed Assortment | Premium Mix | Multi-color harvest (red, white, yellow) | 40–60 sets per 8 oz. | Amazon |
| TomorrowSeeds French Shallot Sets | Mid-Range | Gourmet mild shallot flavor | 20+ bulbs, sandy soil preference | Amazon |
| Stargazer Perennials Yellow Stuttgarter | Mid-Range | Storage onions with mild sweetness | 50–60 bulbs per 8 oz. | Amazon |
| Country Creek Yellow Onion Starter Sets | Budget | High-volume early green onions | 100 sets per order | Amazon |
| theseedhouse Egyptian Walking Onion | Premium | Perennial self-propagating heirloom | Hardy to zone 3, top-set bulbils | Amazon |
In‑Depth Reviews
1. Stargazer Perennials Mixed Onion Assortment
This 8-ounce assortment delivers red, white, and yellow heirloom onion sets in a single package, giving you three distinct flavor profiles from one planting. The sets are hand-sorted and suited to zones 3–10, covering nearly every home garden climate in the continental US. Customer reports consistently note near-100% germination, with many reviewers harvesting green onions through winter in milder regions.
The intermediate and day-neutral genetics mean these bulbs bulb reliably whether you garden in Michigan or Texas, removing the guesswork of day-length calculation. Each order typically contains 40 to 60 sets, providing enough density for a 4×4 raised bed or a generous row in an in-ground plot. The included planting guide adds value for first-time onion growers.
Some bulbs may arrive dried out depending on transit conditions, though most buyers report only a few unusable sets per batch. The mix leans toward smaller bulbs, which store better but take a bit longer to reach full size compared to large single-variety sets.
What works
- Tri-color variety in one order saves sourcing time
- Excellent germination rates reported across multiple seasons
- Wide zone compatibility (3–10) suits most US gardens
What doesn’t
- Occasional dried bulbs in shipment
- Set count varies and can be lower than expected
2. TomorrowSeeds Monique French Shallot Sets
For gardeners who want a true gourmet heirloom, these Monique French shallot sets produce elongated bulbs with a mild, sweet taste that elevates sauces and roasts beyond standard onion flavor. The semi-long F1 genetics are bred for consistent bulbing in home garden conditions, and the pink-red skins add visual appeal to the harvest.
Each pack contains 20+ bulbs, a reasonable count for a dedicated shallot bed or container planting. The sets prefer sandy soil with moderate watering, making them an excellent match for raised beds with well-draining mix. They are also suited to partial shade, which offers flexibility if your garden lacks full sun across the entire bed.
The main limitation is the smaller quantity compared to standard onion sets — you get around a third of the bulbs per dollar compared to bulk yellow options. These are also an annual crop, so you will need to order fresh sets each year rather than letting them propagate on their own.
What works
- Authentic French shallot flavor for culinary use
- Adaptable to partial shade conditions
- Easy to plant with minimal soil prep
What doesn’t
- Lower bulb count per package
- Not a perennial variety — requires yearly replanting
3. Stargazer Perennials Yellow Stuttgarter Onion Sets
The Yellow Stuttgarter is a classic intermediate-day heirloom that has been a staple in American gardens for generations. This 8-ounce package delivers 50 to 60 USA-grown bulbs that produce mildly sweet, golden-skinned onions ideal for fresh eating, caramelizing, or long-term storage.
Stuttgarter sets are known for their slow-bolting behavior and strong keeping qualities, meaning you can harvest in mid-summer and still have firm onions in your pantry come December. The sets are non-GMO and include a detailed growing guide that covers planting depth, spacing, and watering schedules — especially helpful for beginners transitioning from seeds to sets.
These cannot be shipped to Washington or Idaho due to agricultural restrictions, which limits availability for Pacific Northwest gardeners. The bulbs are also on the smaller side, which improves storage life but may delay your first scallion harvest compared to larger sets.
What works
- Excellent long-term storage potential
- Slow bolting reduces harvest timing issues
- Good count per ounce for the price
What doesn’t
- Cannot ship to WA or ID
- Smaller bulb size means slower green top production
4. theseedhouse Egyptian Walking Onion Bulbils
If you want a truly self-sustaining heirloom, the Egyptian Walking Onion is in a class of its own. Instead of growing a single bulb underground, this perennial variety produces clusters of small bulbils at the top of the stalk. When the stalk bends under the weight, the bulbils touch the soil and root themselves — literally “walking” across your garden bed each season.
Hardy down to zone 3, this onion thrives in sandy, well-drained soil and full sun with minimal maintenance once established. The bulbils can be used like small shallots or scallions, offering a continuous harvest without replanting year after year. Each order provides 6 bulbils, enough to start a small colony that will expand naturally over time.
The main trade-off is that these do not produce large storage bulbs like Stuttgarter or Yellow sets. The flavor is stronger and more pungent than typical bulb onions, and the plant’s spreading habit may overwhelm a small raised bed if not divided annually.
What works
- Perennial growth eliminates yearly replanting
- Extremely cold hardy for northern gardens
- Novel “walking” propagation is low-maintenance
What doesn’t
- No large bulb production for storage
- Can spread aggressively in small beds
5. Country Creek Yellow Onion Starter Sets
For gardeners who want to maximize output without a big investment, Country Creek’s pack of 100 yellow onion sets delivers serious volume at a budget-friendly per-bulb cost. These are standard yellow onion sets ideal for early green onion harvests or for growing into medium-sized dry bulbs for summer use.
The sets ship in a compact 9x4x12-inch package, and the 100-count quantity gives you enough to plant a full 20-foot row at 2-inch spacing or to fill several large containers. The bulbs are suitable for direct outdoor planting after the last frost and respond well to consistent moisture and full sun.
Because these are commodity-grade sets rather than specifically labeled heirloom varieties, you may not get the same flavor depth or storage longevity as named cultivars like Stuttgarter. The lack of variety information also makes it harder to predict day-length response in non-standard zones.
What works
- Very high bulb count for the price point
- Quick green onion harvest from large sets
- Compact packaging for easy handling
What doesn’t
- No specific heirloom variety named
- Bulb quality can vary between batches
Hardware & Specs Guide
Day-Length Adaptation
Heirloom onion genetics fall into long-day (14+ hours), short-day (10–12 hours), and intermediate-day (12–14 hours) categories. Intermediate-day sets, like the Stuttgarter and Mixed Assortment in this guide, are the most forgiving for home gardeners between 32° and 42° latitude. Long-day varieties perform best north of the 40th parallel, while short-day types are essential for southern gardens below the 35th parallel.
Set Size and Bulb Count
The diameter of each set directly affects how quickly it produces green tops and how large the final bulb grows. Sets around ½ inch in diameter (common in the Stargazer Perennials packs) take longer to establish but yield larger storage bulbs. Larger sets, such as those in the Country Creek 100-count, produce scallions faster but may bolt earlier in hot weather. Count per package ranges from 6 bulbils (Egyptian Walking) to 100 sets (Country Creek), so choose based on your bed size and harvest timeline.
FAQ
What is the difference between onion sets and onion plants or transplants?
Can I grow heirloom onion sets in containers or raised beds?
How do I know if an heirloom onion set is still viable after storage?
Why do my onion sets bolt (flower) before forming a bulb?
Final Thoughts: The Verdict
For most gardeners, the heirloom onion plants winner is the Stargazer Perennials Mixed Onion Assortment because it delivers three color varieties with proven germination across zones 3–10. If you want a true perennial that returns year after year without replanting, grab the theseedhouse Egyptian Walking Onion Bulbils. And for budget-conscious gardeners who need a high volume of sets for early green onions, nothing beats the Country Creek Yellow Onion Starter Sets.