Where to Buy the Best Onion Seeds for Raised Beds & Backyard Gardens | Top Varieties, Tips & Online Seed Sources
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Onions are one of the most profitable, space-efficient crops in any home garden — but only if you start with the right seed. Growing onions from seed instead of store-bought sets gives you access to more varieties, larger bulbs, better flavor, and longer storage life. Whether you garden in raised beds, containers, or traditional garden rows, choosing the best onion seeds can dramatically improve yields and consistency.
This guide explains exactly where to buy onion seeds online, which types work best for different climates, and how to grow onions successfully from seed for big harvests and long-term pantry storage.
Why Onion Seeds Produce Better Results Than Onion Sets
Many gardeners still buy onion “sets” at big box stores — but they are actually last year’s leftover bulbs. That means:
❌ Faster bolting
❌ Smaller bulbs
❌ Only 1–2 varieties available
❌ Shorter storage time
Onion seeds provide:
✔ Bigger, uniform bulbs
✔ Hundreds of varieties to choose from
✔ Better disease resistance
✔ Lower cost per plant
✔ Longer storage life — up to 8–10 months
➡ One onion seed packet can produce 200–300 onions — FAR cheaper than buying sets.
Best Place to Buy Onion Seeds Online
To grow strong, uniform onions, you need high quality seed — not cheap repackaged packets.
You can buy onion seeds directly from Trailing Petunia in BOTH regular and bulk sizes:
🧅 Onion Seeds – Regular Packs (Home Gardeners)
✔ Perfect for raised beds, backyard rows & container gardens
👉 https://www.trailingpetunia.com/search?q=onion&options%5Bprefix%5D=last
🧅 Onion Seeds – Bulk Packs (Market Growers & Homesteads)
✔ Ideal for CSA growers, food gardeners & large garden plots
👉 https://www.trailingpetuniabulkseeds.com/search?q=onion&options%5Bprefix%5D=last
Need other vegetable seed categories?
🌱 All Smaller Garden Packs
👉 https://www.trailingpetunia.com
🌾 All Bulk Vegetable & Flower Seeds
👉 https://www.trailingpetuniabulkseeds.com/
Best Onion Types for Different Growing Zones
Choosing the right day-length category is critical:
🟡 LONG-DAY ONIONS
Best for Northern growers — bulb when days reach 14–16 hrs
➡ Examples: Walla Walla, Ringmaster, Patterson
🔴 SHORT-DAY ONIONS
Best for Southern growers — bulb at 10–12 hr days
➡ Examples: Texas Early Grano, Red Creole, Southern Belle
🟢 INTERMEDIATE DAY ONIONS
Grow almost anywhere in the U.S.
➡ Examples: Candy Onion, Red Candy Apple, Superstar
PRO TIP:
Grow two types to extend your onion harvest window.
How to Grow Onions From Seed (Step-by-Step)
🔥 Start Seeds Indoors
Begin 10–12 weeks before transplant
Ideal temp: 65–75°F
✂ Trim Seedlings Every 2 Weeks
Cut tops back to 4" — this thickens stems & increases bulb size
🌱 Transplant Early
As soon as soil can be worked — onions LIKE cool spring weather
📏 Spacing Controls Bulb Size
Large storage bulbs → 4–6" apart
Mini onions → 2" apart
💧 Water Deeply & Consistently
Dry swings = split bulbs + strong flavor
⏳ Harvest at Natural Top Fall
Cure 7–14 days before storage
🔗 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
🔗 Buy Onion Seeds Online: Best Garden Seed Varieties for Home & Market Growers
https://www.trailingpetunia.com/blogs/news/buy-onion-seeds-online-best-garden-seed-varieties-for-home-market-growers
🔗 Best Onion Seeds to Buy for Your Vegetable Garden
https://www.trailingpetunia.com/blogs/news/best-onion-seeds-to-buy-for-your-vegetable-garden-where-home-gardeners-should-order-seeds-online
🔗 Best Eggplant Seeds for Home Gardens
https://www.trailingpetunia.com/blogs/news/best-eggplant-seeds-for-home-gardens-where-to-buy-high-quality-vegetable-seeds-online
FAQ – Buying & Growing Onion Seeds
Q: Is it worth growing onions from seed?
Absolutely — biggest yields, more varieties, long storage.
Q: How many onions do I need per person?
Plan 50–80 onions per person for full-year use.
Q: Can onions grow in containers?
YES — use 12+ inch deep pots, space 3" apart.
Q: Do onions need full sun?
Yes. Less sun = small bulbs.
Q: Are onion seeds hard to start?
No — they just require extra time, not extra skill.