White Bermuda (Early Grano)

Onion

Zone 5a Save Garden

Botanical illustration of White Bermuda (Early Grano)

🌱 90d to harvest Bulbing

Sweetly aromatic and cleanly mild, White Bermuda (Early Grano) forms crisp, snow-white bulbs with a tender, fine-grained bite tha…

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	May 8th
Transplant / Sow Outdoors	May 8th
Harvest Begins	Aug 6th
Harvest Ends	Sep 30th

Crop Details

Trait	Value
Days to Maturity	90
Sun Requirements	Full Sun
Growth Habit	Bulbing
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	40
Min Night Temp (°F)	35
Harden Off (days)	7

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Frequently Asked Questions

How do I manage onion (Allium cepa) problems like downy mildew and botrytis blight?

Onions (Allium cepa) commonly develop downy mildew and neck/foliar blights in cool, wet weather. Improve airflow with wider spacing, avoid watering the foliage (water at the soil line), and remove any yellowing or collapsing leaves quickly. If the problem persists, use an onion-appropriate fungicide and follow the label timing starting as soon as you see mottling or gray/purple lesions.

What watering schedule keeps Allium cepa bulbs sizing well during the 60–90 day growing phase?

During active bulb bulking (roughly weeks 7–13), keep the soil consistently moist but not soggy—aim for about 1 inch of water per week, adjusting for heat and rainfall. Let the top 1–2 inches of soil dry slightly between waterings to prevent rot, then water deeply to reach the onion roots. Stop or sharply reduce watering once tops begin to yellow and fall over, so the bulbs cure better.

When is Allium cepa (white Bermuda-type) ready to harvest?

Harvest when 50–70% of the tops have fallen over and the necks feel tight rather than soft. For many 90-day plantings, this is around 90 days from transplanting/typical sowing timeline, but use the top condition as your main guide. Lift on a dry day, cure the bulbs in a warm, airy spot for 1–2 weeks, and then trim roots and tops for storage.

Sweetly aromatic and cleanly mild, White Bermuda (Early Grano) forms crisp, snow-white bulbs with a tender, fine-grained bite that stays pleasantly delicate from harvest through storage. The skins are thin and bright, the flesh crisp and juicy, making this an ideal choice for fresh use and for turning into smooth, fragrant preparations where its gentle character shines. Grow it for reliable, early-season performance—an elegant white onion that looks as good as it tastes.

Sowing Tips

Transplant Conditions

Wait until soil reaches 40°F and nights stay above 35°F before moving outdoors. Harden off for 7 days first.

Expert Note

For short-day onions like Early Grano, aim for a cool start and transplant into well-drained soil as soon as it’s workable to avoid bolting and to size bulbs well before long warm days.