White Grano

Family: Amaryllidaceae Vegetable

Sweetly fragrant and delicately mild, White Grano forms pristine, ivory-white bulbs with a crisp, fine-grained snap and a clean, juicy bite.

At maturity, the skins stay smooth and tight, making the bulbs ideal for fresh use as well as roasting until they turn tender and caramel-kissed. Grow White Grano for a refined, market-class white onion that shines in salads, savory sauces, and pickled preparations alike—its gentle flavor keeps every dish bright and balanced.

Light: Full SunMaturity: 95 DaysHabit: Bulbing

Planting schedules and alerts are optimized for Columbus (Zone 6b).

Crop Dates

Milestone	Date
Start Indoors	Feb 14th
Last Frost	Apr 25th
Transplant / Sow Outdoors	Apr 11th
Harvest Begins	Jul 15th
Harvest Ends	Oct 16th

Crop Details

Trait	Value
Days to Maturity	95
Sun Requirements	Full Sun
Growth Habit	Bulbing
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	45
Min Night Temp (°F)	28
Harden Off (days)	6

Culinary Notes

Chef's Note

White Grano is the kind of white onion that stays polite: crisp, fine-grained, and juicy, so it doesn’t overpower raw preparations. When you roast it, it turns sweet and tender fast, making it ideal for caramel-adjacent flavor without the sharp bite.

Best Uses

thin slicing for fresh salads where you want crisp snap without harshness
quick pickling for bright, clean acidity—no need to mask the flavor
roasting until soft and sweet for pizza, bowls, or topping meats
using in savory sauces and reductions for a gentle, perfumed base

Flavor Profile

sweetly fragrant delicately mild onion bite clean, juicy snap roasting turns caramel-kissed and tender

Kitchen Pairings

aged balsamic vinegar fresh thyme butter goat cheese white wine champagne vinegar

Frequently Asked Questions

White Grano (Allium cepa): How do I prevent and manage onion downy mildew (Peronospora destructor) and other foliar fungal issues?

Onions (Allium cepa) are very prone to downy mildew when weather stays cool and humid, causing gray-purple fuzzy growth on leaves and tip dieback. Water only at the soil line and space plants so leaves dry quickly; remove and discard badly infected leaves early. If it keeps spreading, switch to a labeled fungicide for onions and re-apply according to the label interval, starting at the first signs (often in wet spells).

White Grano onion: How often should I water during the main growing phase to keep bulbs forming well?

During bulb formation, keep soil consistently evenly moist but not soggy—aim for about 1 inch of water per week, adjusted for your rainfall and heat. Let the top 1–2 inches dry slightly between waterings to avoid rot, especially around the crown. Stop or sharply reduce watering about 2–3 weeks before harvest so the necks dry down and bulbs cure properly.

White Grano onion: How can I tell when it’s ready to harvest at ~95 days?

Harvest when about 50–70% of the plants have fallen over and the necks are soft but starting to dry, usually around the listed 95 days for your crop. Gently lift one bulb to check: skins should be papery and well-colored, with firm bulbs and minimal green showing at the top. Harvest on a dry day, then cure the onions in a warm, airy place out of direct rain until necks are tight and skins are fully papery.