White Sweet Spanish

Family: Amaryllidaceae Vegetable

Sweetly fragrant and remarkably mild, White Sweet Spanish brings a clean, honeyed onion character with a tender bite that feels almost silky.

At maturity, the bulbs form smooth, pure white globes with a fine, dry skin and a crisp, juicy interior—ideal for fresh use and for turning into glossy, mellow sauces that let its sweetness shine. Grow it for a long, steady season (about 105 days) and enjoy the satisfaction of harvest-ready bulbs that store with confidence while staying pleasantly sweet.

Light: Full SunMaturity: 105 DaysHabit: Bulbing

Botanical illustration of White Sweet Spanish

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

Crop Dates

Milestone	Date
Start Indoors	Feb 14th
Last Frost	Apr 25th
Transplant / Sow Outdoors	Apr 25th
Harvest Begins	Aug 8th
Harvest Ends	Oct 16th

Crop Details

Trait	Value
Days to Maturity	105
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)	5

Culinary Notes

Chef's Note

White Sweet Spanish cooks down into a glossy, silky sweetness without the sharpness that can make other onions feel aggressive. It’s built for slicing and for long, gentle reduction—where the honeyed aroma stays intact and the texture turns luxuriously soft rather than stewy.

Best Uses

thinly sliced raw for salads and bagel-style toppings (no harsh bite)
slow-cooked until deeply glossy for sweet caramelized-style jam
mellow, velvety onion sauces that can go nearly spoonable without bitterness
grilled or roasted wedges where the edges brown but the center stays juicy

Flavor Profile

sweet, honeyed onion aroma mild, tender bite with a juicy crunch silky melt when cooked clean finish with gentle acidity

Kitchen Pairings

balsamic vinegar butter or olive oil fresh thyme Gruyère chicken stock goat cheese

Frequently Asked Questions

White Sweet Spanish (Allium cepa): What should I do if I see purple-gray mold or white rot at the base?

This onion is prone to white rot (Sclerotium) and fungal rots that start at the base and spread upward. Pull and destroy affected plants, avoid disturbing the soil around them, and don’t replant onions or related alliums in the same bed for several years. Improve drainage, keep foliage dry (water at the soil line), and use fresh, clean transplants/sets to reduce new infections.

For White Sweet Spanish (Allium cepa), how often should I water during the main bulbing phase?

During bulb formation, keep the soil evenly moist but not soggy—about 1 inch (2–3 cm) per week total, adjusted for heat and rainfall. Water deeply so moisture reaches the roots, then let the top couple centimeters of soil dry slightly before watering again. When bulbs are well-sized (near late growth), reduce watering to prevent soft, watery bulbs.

How can I tell when White Sweet Spanish (Allium cepa) is ready to harvest?

Harvest at around 105 days when about half to three-quarters of the tops have fallen over and the necks start to soften. Lift bulbs carefully (don’t yank), and leave them to cure in a warm, airy, shaded spot until outer skins are papery and the neck is tight. If you cut too early, the neck won’t cure properly and storage life will be much shorter.