Granex Yellow

Family: Amaryllidaceae Vegetable

Planting Schedule

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Sunlit and sweet, Granex Yellow forms large, globe-flat bulbs with a mellow, honeyed bite that feels tender rather than sharp.

The flesh is crisp and juicy with a fine-grained texture, ideal for showcasing in bold, golden-forward preparations—roasted for caramel depth, sliced for fresh salads, or simmered into silky sauces and savory relishes. A short-day favorite for home gardeners seeking dependable size and a bright, market-ready look at harvest.

Light: Full SunMaturity: 100 DaysHabit: Bulbing

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Granex Yellow 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	Protected Environment Only
Zone 2b	Apr 3rd	May 8th	Aug 16th – Aug 25th
Zone 3a	Apr 3rd	May 8th	Aug 16th – Sep 1st
Zone 3b	Apr 7th	May 12th	Aug 20th – Sep 21st
Zone 4a	Apr 3rd	May 8th	Aug 16th – Sep 24th
Zone 4b	Apr 1st	May 6th	Aug 14th – Sep 27th
Zone 5a	Mar 27th	May 1st	Aug 9th – Sep 30th
Zone 5b	Mar 23rd	Apr 27th	Aug 5th – Oct 5th
Zone 6a	Mar 20th	Apr 24th	Aug 2nd – Oct 10th
Zone 6b	Mar 14th	Apr 18th	Jul 27th – Oct 16th
Zone 7a	Mar 9th	Apr 13th	Jul 22nd – Oct 20th
Zone 7b	Feb 27th	Apr 3rd	Jul 12th – Oct 28th
Zone 8a	Feb 18th	Mar 25th	Jul 3rd – Nov 5th
Zone 8b	Feb 9th	Mar 16th	Jun 24th – Nov 12th
Zone 9a	Jan 23rd	Feb 27th	Jun 7th – Nov 26th
Zone 9b	Dec 29th	Feb 2nd	May 13th – Dec 9th
Zone 10a	—	Oct 1st	Jan 9th – Feb 28th
Zone 10b	—	Oct 1st	Jan 9th – Feb 28th
Zone 11a	—	Oct 1st	Jan 9th – Feb 28th
Zone 11b	—	Oct 1st	Jan 9th – Feb 28th
Zone 12a	—	Oct 1st	Jan 9th – Feb 28th
Zone 12b	—	Oct 1st	Jan 9th – Feb 28th
Zone 13a	—	Oct 1st	Jan 9th – Feb 28th
Zone 13b	—	Oct 1st	Jan 9th – Feb 28th

Crop Details

Trait	Value
Days to Maturity	100
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)	7

Culinary Notes

Chef's Note

Granex Yellow leans sweet and tender, so it caramelizes without going harsh—great for getting that glossy, golden onion jam feel without losing bite. Use it raw or lightly cooked to keep the fine-grained crunch, and let butter and thyme do the heavy lifting.

Best Uses

thick slices for caramel-crisp roasts (high heat, short time)
raw-applications where the bite stays sweet, like salad or salsa fresca
slow-simmered, silky onion gravy or pan sauce
yellow-forward relishes or quick pickle for a crisp sweet-savory snap

Flavor Profile

mellow, honeyed bite crisp, juicy crunch golden, caramel-sweet when cooked fine-grained tenderness that won’t turn mushy fast

Kitchen Pairings

butter olive oil thyme black pepper balsamic vinegar gruyere cheese

Frequently Asked Questions

What pest or disease most commonly affects Allium cepa (Granex Yellow onion), and what should I do first?

Onion fly and thrips are common pests, and they often show up as wilting tips, silvery streaking, or larvae around the bulb neck. Start by removing and destroying any onions with soft, foul-smelling bases (a sign of bacterial rot) and check plants weekly for early thrips damage. Use insect netting over newly planted seedlings and apply an insecticidal soap for thrips when populations are low; keep the bed free of weeds that host pests.

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

During the main bulb-forming period (roughly mid-season after plants are well established), keep the soil evenly moist with about 1 inch of water per week, split into 1–2 waterings if it’s hot. Let the top few centimeters of soil dry slightly between waterings so bulbs don’t stay waterlogged, but don’t allow the bed to dry out for long stretches because onion bulbs can stall or split. Once tops begin to yellow and fall over near maturity, reduce watering to help curing and prevent rot.

How can I tell when Granex Yellow onions are ready to harvest?

Harvest when about half to two-thirds of the plants have fallen over and the necks are drying and tightening, typically around 100 days from planting. Lift one or two bulbs to confirm—skins should be papery and the bulb should feel firm with no soft spots. Harvest on a dry day to reduce skin damage, then cure the onions in a warm, airy place out of direct sun until the necks are fully dry.