Southport White Globe

Onion

Zone 12a Save Garden

Botanical illustration of Southport White Globe

🌱 90d to harvest Bulbing

Sweetly aromatic and exceptionally mild, Southport White Globe forms perfectly rounded bulbs with a clean, white skin that glows …

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	Jan 1st
Transplant / Sow Outdoors	Jan 1st
Harvest Begins	Apr 1st
Harvest Ends	Dec 31st

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)	45
Min Night Temp (°F)	35
Harden Off (days)	Not Required

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Frequently Asked Questions

How do I manage onion (Allium cepa) problems with downy mildew (caused by Peronospora destructor)?

Downy mildew on onions shows as gray-purple, fuzzy growth on leaf tips and yellowing that spreads from the top. Remove and destroy infected leaves, improve airflow (space plants and keep weeds down), and avoid overhead watering so foliage stays dry. If you see active spread in humid weather, switch to a labeled onion fungicide strategy early and repeat according to the label as conditions remain favorable.

How often should I water Allium cepa during the bulbing phase (after the tops reach full height)?

During bulbing, keep the soil consistently evenly moist—about 1 inch of water per week total, adjusted for heat and soil type—so bulbs enlarge without splitting. Water deeply when the top 1 inch of soil feels dry, then let the surface dry slightly before watering again to prevent rot. Stop watering gradually in the final 2–3 weeks before harvest so skins dry and bulbs cure properly.

How can I tell when Southport White Globe onion (Allium cepa) is ready to harvest?

Harvest when about 1/2 to 2/3 of the plants have fallen over naturally and the necks are starting to soften, typically around 90 days. The outer skins should feel papery and the bulb size should match the variety’s globe shape. If rain is forecast, harvest promptly to reduce rot risk and cure bulbs in a warm, airy, shaded spot.

Sweetly aromatic and exceptionally mild, Southport White Globe forms perfectly rounded bulbs with a clean, white skin that glows against the cool-season garden. The flesh stays crisp and juicy with a fine, tender bite—ideal for fresh use, quick roasting, and brightening sauces where its gentle flavor shines. Grow it for dependable 90-day performance and globe-size bulbs that store with confidence for weeks of flavorful enjoyment.

Sowing Tips

Transplant Conditions

Wait until soil reaches 45°F and nights stay above 35°F before moving outdoors.

Expert Note

For long-day storage onions like ‘Southport White Globe,’ prioritize a sunny site and consistent moisture so bulbs form evenly and store well.