Why Are My Onions Too Hot? Choosing Sweet Varieties

If your homegrown onions consistently taste fiery, the culprit is likely the variety, not your soil. While compacted, dry soil can intensify flavor, the primary factor is genetics. Onions fall into two broad categories: sweet (high water content, low sulfur) and storage or "hot" onions (lower water, higher sulfur compounds).

Sweet Onion Varieties

Look for these proven sweet types:

• Yellow Granex (Vidalia-type)
• Walla Walla
• Texas Sweet
• Sweet Spanish
• Maui

Storage (Hot) Onion Varieties

These are bred for keeping quality and pungency:

• Yellow Bermuda
• White Bermuda
• Copra
• Redwing

Cultural Tips for Milder Onions

• Ensure loose, well-drained soil with consistent moisture—water stress increases pungency.
• Apply sulfur-containing fertilizers sparingly; sulfur boosts the compounds that cause heat.
• Harvest at the right time: sweet onions are best eaten fresh, while storage onions need curing.

Select a sweet variety suited to your day-length region (short-day for the South, long-day for the North, intermediate for the middle) and you'll enjoy mild, juicy onions straight from the garden.