Best Onion Seeds to Buy for Your Vegetable Garden | Where Home Gardeners Should Order Seeds Online
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Onions are one of the most productive and profitable crops you can grow in a home garden. They store for months, they require very little space, and one small seed packet produces enough onions to feed a family all year. Whether you grow in raised beds, containers, or full-size garden rows, choosing the best onion seeds is the most important step for big bulb size, long shelf life, and reliable harvests.
This complete guide shows you where to buy onion seeds online, which varieties perform best in different regions, and how to grow onions from seed for maximum yield and flavor.
Why Buy Onion Seeds Instead of Onion Sets?
Most in-store onion sets are not designed for long-term growth. They:
❌ Bolt early
❌ Produce smaller bulbs
❌ Offer only 1–2 varieties
Onion seeds, on the other hand, provide:
✔ Bigger, uniform bulbs
✔ Dozens of flavor & storage choices
✔ Better disease resistance
✔ Lower cost per plant
✔ Longer pantry keeping
One $4 seed packet can grow 200+ onions — making onions one of the highest-value vegetables per square foot.
Best Place to Buy Onion Seeds Online
To grow onions successfully, you MUST start with fresh, professionally stored seed — NOT cheap repackaged packets.
You can order onion seeds directly from Trailing Petunia in both regular garden packs and bulk quantities:
🧅 Onion Seeds – Regular Size Packs
➡ Perfect for backyard growers & raised bed gardens
👉 https://www.trailingpetunia.com/search?q=onion&options%5Bprefix%5D=last
🧅 Onion Seeds – Bulk Quantities
➡ Ideal for market growers, CSA farms & food gardeners
👉 https://www.trailingpetuniabulkseeds.com/search?q=onion&options%5Bprefix%5D=last
Need more vegetable seeds?
🌱 ALL smaller seed packs → https://www.trailingpetunia.com
🌾 ALL bulk seed packs → https://www.trailingpetuniabulkseeds.com/
Best Onion Varieties to Grow at Home
Different climates require different onion types:
🟡 LONG DAY ONIONS
Grow best in Northern states
Bulb when days reach 14–16 hours
→ Yellow Sweet Spanish, Ringmaster, Walla Walla
🔴 SHORT DAY ONIONS
Grow best in Southern states
Bulb at 10–12 hour days
→ Texas Early Grano, Georgia Sweet, Red Creole
🧅 INTERMEDIATE ONIONS
Grow in most of the U.S.
Dependable storage + sweet flavor
→ Candy, Red Candy Apple, Superstar
➡ PRO TIP: Grow two onion daylength types for a longer harvest window.
How to Grow Onions from Seed
🔥 Start 10–12 Weeks Before Transplanting
Sow in trays, keep at 65–75°F
✂ Trim Seedlings Every 2 Weeks
Cut tops back to 4" – this builds thicker stems & bigger bulbs
🌱 Transplant as Soon as Soil Is Workable
Onions tolerate frost and prefer cool spring growth
📏 Spacing Controls Size
Large onions → 4–6" apart
Mini onions → 2" apart
🌞 Full Sun Required
6 hours MINIMUM for proper bulb formation
🧅 Harvest When Tops Fall Naturally
Cure 7–14 days in shade for long storage
🔗 Onion Seeds: Best Place to Buy Garden & Vegetable Seeds Online
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 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 – Onion Seeds for Home Gardens
Q: Can I direct sow onion seeds?
Yes, but indoor transplanting gives earlier, larger bulbs.
Q: How many onion plants does one family need?
Plan 50–80 per person for full-year supply.
Q: Do onions grow well in raised beds?
YES — loose soil + controlled watering = perfect bulbs.
Q: Should I grow bunching onions or bulb onions?
Grow both for year-round harvest versatility.
Q: How long do onion seeds last?
1–2 years stored properly — after that, germination drops.