Yellow Granex

Family: Amaryllidaceae Vegetable

Planting Schedule

Provide your location or planting zone to unlock dates and add Yellow Granex to a garden.

Golden warmth spills from every Yellow Granex bulb—sweet, mellow flavor with a gentle bite that lingers like sun on skin.

At maturity, the bulbs form broad, flattened globes with crisp, papery outer layers and a dense, juicy interior that stays tender and slice-ready. Grow Yellow Granex for reliable harvests around 90 days, ideal for fresh use, roasting, and caramelizing into rich, golden sauces.

Light: Full SunMaturity: 90 DaysHabit: Bulbing

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Yellow Granex 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 16th	May 18th	Aug 16th – Aug 29th
Zone 2b	Mar 6th	May 8th	Aug 6th – Aug 25th
Zone 3a	Mar 6th	May 8th	Aug 6th – Sep 1st
Zone 3b	Mar 10th	May 12th	Aug 10th – Sep 21st
Zone 4a	Mar 6th	May 8th	Aug 6th – Sep 24th
Zone 4b	Mar 4th	May 6th	Aug 4th – Sep 27th
Zone 5a	Feb 27th	May 1st	Jul 30th – Sep 30th
Zone 5b	Feb 23rd	Apr 27th	Jul 26th – Oct 5th
Zone 6a	Feb 20th	Apr 24th	Jul 23rd – Oct 10th
Zone 6b	Feb 14th	Apr 18th	Jul 17th – Oct 16th
Zone 7a	Feb 9th	Apr 13th	Jul 12th – Oct 20th
Zone 7b	Jan 30th	Apr 3rd	Jul 2nd – Oct 28th
Zone 8a	Jan 21st	Mar 25th	Jun 23rd – Nov 5th
Zone 8b	Jan 12th	Mar 16th	Jun 14th – Nov 12th
Zone 9a	Dec 26th	Feb 27th	May 28th – Nov 26th
Zone 9b	Dec 1st	Feb 2nd	May 3rd – Dec 9th
Zone 10a	—	Oct 1st	Dec 30th – Feb 28th
Zone 10b	—	Oct 1st	Dec 30th – Feb 28th
Zone 11a	—	Oct 1st	Dec 30th – Feb 28th
Zone 11b	—	Oct 1st	Dec 30th – Feb 28th
Zone 12a	—	Oct 1st	Dec 30th – Feb 28th
Zone 12b	—	Oct 1st	Dec 30th – Feb 28th
Zone 13a	—	Oct 1st	Dec 30th – Feb 28th
Zone 13b	—	Oct 1st	Dec 30th – Feb 28th

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

Culinary Notes

Chef's Note

Yellow Granex brings a sweeter profile than sharp storage onions, so it browns fast without going acrid. Use it when you want tender slices that caramelize into glossy strands—or roast until the edges crisp and the center turns almost custardy.

Best Uses

caramelizing into jammy, golden strands without turning bitter
roasting for soft-center sweetness and browned edges
fresh use in salads where you want mellow onion impact
slow-reduced pan sauce base that turns silk-golden

Flavor Profile

sweet, mellow onion flavor gentle bite with a clean, lingering allium finish juicy, slice-friendly interior with firm layers

Kitchen Pairings

butter thyme balsamic vinegar beef or pork Gruyère black pepper

Frequently Asked Questions

What pest or disease commonly affects Allium cepa (yellow onions), and how can I stop it?

Onion thrips can cause silvery streaking and distorted onion leaves, especially in warm, dry spells. Check plants weekly and spray insecticidal soap or spinosad according to label directions; keep weeds down because they host thrips. If you see soft, rotting bulbs or purple-gray mold at the neck, remove affected plants immediately and improve airflow—onions in wet, crowded beds develop neck rot and other fungal issues.

How often should I water Allium cepa during the main growing phase (bulb formation)?

During bulb formation, keep soil consistently evenly moist but not soggy—about 1 inch of water per week, adjusting for heat and rainfall. Water deeply to reach the root zone, then let the top 1–2 inches of soil dry slightly before watering again. When about 10–20% of the tops begin to fall over near the end of the 90-day cycle, reduce watering to help bulbs cure and prevent watery rot.

How do I know when Allium cepa (yellow Granex-style onions) are ready to harvest?

Harvest when plants reach roughly 90 days from planting and most tops have turned yellow and started to fall over, with dry, tight necks. Gently lift one or two bulbs to confirm the skin is papery and bulbs are fully sized. Leave onions in place to cure for a short period with good airflow, then cure longer indoors out of direct sun if weather is humid.