White Sweet Spanish

Onion

Zone 1a Save Garden

Botanical illustration of White Sweet Spanish

🌱 105d to harvest Bulbing

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

Crop Dates

Milestone	Date
Start Indoors	Apr 6th
Last Frost	Jun 15th
Transplant / Sow Outdoors	Jun 15th
Harvest Begins	Sep 28th
Harvest Ends	Jul 15th

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

Recommended Companions

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.

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.

Sowing Tips

Transplant Conditions

Wait until soil reaches 45°F and nights stay above 35°F before moving outdoors. Harden off for 5 days first.

Expert Note

For large globe bulbs, keep transplants/sets evenly watered during bulb formation and avoid nitrogen-heavy feeding after the tops establish.