Buy Onion Seeds Online: Best Garden Seed Varieties for Home & Market Growers
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Onions are one of the most essential vegetable crops for gardeners, homesteaders, and small farm growers — yet most people don’t realize how much better their harvests can be when they start with high-quality onion seeds instead of store-bought sets. If you’ve ever ended up with bolting onions, undersized bulbs, or soft storage onions that spoil too quickly, the issue is almost always seed quality.
This complete guide breaks down the best onion seeds to buy online, which varieties perform best in different climates, and why seed-grown onions consistently produce bigger yields, better flavor, and longer storage life. Whether you are growing in raised beds, containers, high tunnels, or traditional rows, this is your blueprint for success.
Why Buy Onion Seeds Instead of Onion Sets?
Onion sets are simply immature onions from the previous season. They are famous for:
❌ Early bolting
❌ Poor sizing
❌ Limited variety selection
Onion seeds, on the other hand, give you:
✔ Bigger bulbs
✔ Access to hundreds of varieties
✔ Better disease resistance
✔ Longer storage onions
✔ Lower cost per plant
One small packet of seed can grow hundreds of onions — making them one of the highest-return crops in the entire vegetable garden.
Where to Buy the Best Onion Seeds Online
To grow uniform, healthy onions, you need fresh, professionally stored seed, not cheap repackaged packets.
You can buy onion seeds directly from Trailing Petunia in both small home garden packs and bulk grower packs:
🧅 Onion Seeds – Home Garden Packs
Perfect for raised beds, container gardens, and backyard growers
👉 https://www.trailingpetunia.com/search?q=onion&options%5Bprefix%5D=last
🧅 Onion Seeds – Bulk Grower Packs
Ideal for CSA growers, homesteads, and large planting
👉 https://www.trailingpetuniabulkseeds.com/search?q=onion&options%5Bprefix%5D=last
Looking for MORE vegetable seed categories?
🌱 Smaller Packs – All Seeds
👉 https://www.trailingpetunia.com
🌾 Bulk Seed Packs – All Crops
👉 https://www.trailingpetuniabulkseeds.com/
Best Onion Varieties for Home Gardeners
Different climate zones require different onion types:
🟡 LONG DAY ONIONS
Best north of roughly Kansas → bulb when day length hits 14–16 hours
Examples: Walla Walla, Patterson, Ringmaster
🔴 SHORT DAY ONIONS
Best in southern states → bulbs at 10–12 hour days
Examples: Texas Early Grano, Red Creole
🧅 INTERMEDIATE DAY ONIONS
Grow in nearly ALL U.S. regions
Examples: Candy Onion, Red Candy Apple
For the biggest pantry yields, plant BOTH a fresh eating type and a long-storage type.
How to Grow Onions From Seed
🔥 Start Indoors Early
Sow 10–12 weeks before transplant
Ideal temp: 68–75°F
🔥 Trim Seedlings
Cut tops back to 4–5" every 2 weeks → makes stronger bulbs
🔥 Transplant When Soil Is Workable
Onions tolerate frost — plant earlier than tomatoes & peppers
🔥 Spacing Determines Bulb Size
4–6" apart for large bulbs
2" apart for mini onions
🔥 Cure Correctly
When tops fall over, lift bulbs and dry 7–14 days before storage
📌 Best Eggplant Seeds for Home Gardens | Where to Buy High-Quality Vegetable Seeds Online
https://www.trailingpetunia.com/blogs/news/best-eggplant-seeds-for-home-gardens-where-to-buy-high-quality-vegetable-seeds-online
📌 Onion Seeds: Best Place to Buy Garden & Vegetable Seeds Online for Big Harvests
https://www.trailingpetunia.com/blogs/news/onion-seeds-best-place-to-buy-garden-vegetable-seeds-online-for-big-harvests
FAQ – Onion Seeds for Gardens
Q: Are onions hard to grow from seed?
No — they just need an early indoor start.
Q: Should I use sets or seeds?
Seeds produce bigger bulbs, more varieties & longer storage.
Q: How many onions do I need for a family of four?
50–80 plants produce a year-round household supply.
Q: Can onions grow in containers?
YES – use a 12"+ deep pot & space 3" apart for fresh harvest onions.
Q: How long do onions store?
Proper storage types keep 6–10 months when cured.