White Grano PRR

Family: Amaryllidaceae Vegetable

Planting Schedule

Provide your location or planting zone to unlock dates and add White Grano PRR to a garden.

Crisp, luminous bulbs with a clean, white sheen—White Grano PRR brings a bright, sweet-on-the-palate character that turns wonderfully mellow in the garden’s first cool nights.

Expect a firm, medium-to-large globe with a tight, dry outer skin and a satisfying snap when you break it open, making it a favorite for fresh slicing, roasting, and slow-simmered sauces. Grow for dependable, 95-day performance and a harvest that stores with confidence, ready whenever your table calls for gentle allium sweetness.

Light: Full SunMaturity: 95 DaysHabit: Bulbing

Botanical illustration of White Grano PRR

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White Grano PRR Planting Dates by USDA Zone

Estimated US hardiness-zone windows for sow, transplant, and harvest. Enter a US ZIP above for exact local dates, or open a zone below.

Zone	Start Indoors	Sow / Transplant	Harvest
Zone 1a	Protected Environment Only
Zone 1b	Protected Environment Only
Zone 2a	Mar 30th	May 18th	Aug 21st – Aug 29th
Zone 2b	Mar 20th	May 8th	Aug 11th – Aug 25th
Zone 3a	Mar 20th	May 8th	Aug 11th – Sep 1st
Zone 3b	Mar 24th	May 12th	Aug 15th – Sep 21st
Zone 4a	Mar 20th	May 8th	Aug 11th – Sep 24th
Zone 4b	Mar 18th	May 6th	Aug 9th – Sep 27th
Zone 5a	Mar 13th	May 1st	Aug 4th – Sep 30th
Zone 5b	Mar 9th	Apr 27th	Jul 31st – Oct 5th
Zone 6a	Mar 6th	Apr 24th	Jul 28th – Oct 10th
Zone 6b	Feb 28th	Apr 18th	Jul 22nd – Oct 16th
Zone 7a	Feb 23rd	Apr 13th	Jul 17th – Oct 20th
Zone 7b	Feb 13th	Apr 3rd	Jul 7th – Oct 28th
Zone 8a	Feb 4th	Mar 25th	Jun 28th – Nov 5th
Zone 8b	Jan 26th	Mar 16th	Jun 19th – Nov 12th
Zone 9a	Jan 9th	Feb 27th	Jun 2nd – Nov 26th
Zone 9b	Dec 15th	Feb 2nd	May 8th – Dec 9th
Zone 10a	—	Oct 1st	Jan 4th – Feb 28th
Zone 10b	—	Oct 1st	Jan 4th – Feb 28th
Zone 11a	—	Oct 1st	Jan 4th – Feb 28th
Zone 11b	—	Oct 1st	Jan 4th – Feb 28th
Zone 12a	—	Oct 1st	Jan 4th – Feb 28th
Zone 12b	—	Oct 1st	Jan 4th – Feb 28th
Zone 13a	—	Oct 1st	Jan 4th – Feb 28th
Zone 13b	—	Oct 1st	Jan 4th – Feb 28th

Crop Details

Trait	Value
Days to Maturity	95
Sun Requirements	Full Sun
Growth Habit	Bulbing
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	75
Min Soil Temp (°F)	45
Min Night Temp (°F)	35
Harden Off (days)	7

Culinary Notes

Chef's Note

White Grano PRR keeps its structure—great for slicing without going limp—and its sweetness mellows fast under heat into a jammy, caramel-adjacent onion base. It’s the kind of onion that earns its keep in sauces where you want flavor that rounds off, not stings.

Best Uses

thin raw slices for crunchy, clean sweetness on sandwiches and salads
roasting until edges caramelize for soft, spoonable tenderness
slow-simmered sauces and braises where you want sweetness without harshness

Flavor Profile

bright, sweet-on-the-palate bite firm, crisp snap with juicy layers turns mellow and jammy when gently cooked

Kitchen Pairings

olive oil thyme butter gruyère beef stock cabernet sauvignon

Frequently Asked Questions

What is a common pest or disease for Allium cepa (white onions), and how can I fix it at home?

One of the most common issues is onion thrips, which cause silvery streaks and distorted, weakened leaves. Start by keeping weeds down and removing heavily damaged leaves early; for control, spray the foliage with insecticidal soap and repeat every 5–7 days for 2–3 cycles, covering leaf undersides. If you notice pinkish fungal growth or soft, rotting bulbs near harvest, discard affected plants and avoid replanting onions in the same soil for a few years.

How often should I water Allium cepa during the main growing phase?

During active leaf and bulb growth, keep the soil consistently moist but not waterlogged—aim for about 1 inch of water per week, adjusted for heat and rainfall. Water deeply 1–2 times per week rather than a little every day, and stop frequent irrigation as bulbs start to swell to prevent soft rot and splitting. Use a simple check: the top 1–2 inches of soil should be moist, not soggy, before the next watering.

How do I tell when Allium cepa is ready to harvest (for ~95 days)?

Harvest when about 50–70% of the tops have flopped over and the necks start to dry down, usually around your ~95-day maturity. Lift a sample bulb to check skin quality—papery white skins should be fully formed and the bulb feels firm. Cure onions by drying them in a warm, airy spot for 1–2 weeks, then trim tops to about 1–2 inches for storage.