Granex Yellow

Family: Amaryllidaceae Vegetable

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

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

Crop Dates

Milestone	Date
Start Indoors	Mar 14th
Last Frost	Apr 25th
Transplant / Sow Outdoors	Apr 18th
Harvest Begins	Jul 27th
Harvest Ends	Oct 16th

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.