Sprouted Store-Bought Onions: Plant or Toss? Better Options for a Real Harvest

Those yellow onions sprouting green shoots in your pantry? They're alive, but planting them in December won't yield full-sized bulbs. Grocery store onions are typically grown from sets or transplants in specific regions and seasons; once they've sprouted in storage, their energy is spent. They'll produce greens (edible as scallions) but won't form a new, large bulb.

How to Grow Onions Successfully in Your Garden

Site & Soil Prep (Do This Now)

• Full sun.
• 10 sq ft area: Mix in 2 cu ft soil conditioner + 120 lbs gritty underlayment sand (coarse sand) to a 10-inch depth. This creates the loose, well-drained soil onions love.

Planting Window

Late November through late January. Earlier planting = larger bulbs. In the South, this is the prime window for short-day or intermediate-day varieties.

What to Plant

• Onion sets (small bulbs) or transplants (bundles of seedlings) from a garden center or mail-order. Choose varieties suited to your day-length (short-day for South, long-day for North).

Spacing & Care

• Plant sets 4 inches apart in rows 10 inches apart.
• Water with half-strength liquid fertilizer at planting.
• Apply full-strength fertilizer in March and April.

Harvest

When tops yellow and fall over (usually early June), lift bulbs, cure in a dry, airy spot for 2 weeks, then store.

Use the Sprouted Ones for Greens

Plant the pantry onions in a pot on a sunny windowsill. Snip the green shoots for salads, eggs, and garnishes—a tasty bonus while you wait for your main crop.