Bianca Di Maggio

Onion

Zone 9a Save Garden

Botanical illustration of Bianca Di Maggio

🌱 70d to harvest Bulbing

Sweet, delicately perfumed bulbs—Bianca Di Maggio—offer a crisp, juicy bite with a clean, mild onion character that lingers like …

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	Mar 6th
Transplant / Sow Outdoors	Mar 6th
Harvest Begins	May 15th
Harvest Ends	Nov 26th

Crop Details

Trait	Value
Days to Maturity	70
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)	5

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Frequently Asked Questions

How do I prevent and treat powdery mildew on Bianca di Maggio (70-day) plants?

Powdery mildew often shows up as a white, floury coating on Bianca di Maggio leaves, especially when nights are cool and humidity stays high. Improve airflow with wider spacing and remove the most affected leaves early in the day, then spray a preventive fungicide option like potassium bicarbonate or a labeled sulfur product if temperatures are safe for the product label. Start treatments at the first white patches and repeat as directed until new growth is clean.

How often should I water Bianca di Maggio during the main growing phase for best growth?

During the main growth phase (after plants are established and before harvest), keep soil consistently evenly moist—aim for about 1 inch of water per week, split into 2–3 waterings if it’s hot or windy. Check moisture by pressing a finger 1–2 inches into the soil: if it feels dry at that depth, water deeply; if it stays moist, wait. Avoid soaking the crowns, which increases disease risk and can stall growth.

When is Bianca di Maggio ready to harvest, and how can I tell?

Harvest Bianca di Maggio at about 70 days when the crop reaches its mature size and the fruit/produce looks fully colored for the variety, with a firm (not rubbery) texture. For many home gardeners, the best indicator is that the plants stop rapidly enlarging and new growth slows—pick at that point to keep quality high. If you’re unsure, harvest one test piece: if it matches the expected size/color and tastes sweet/typical for the variety, harvest the rest within a day or two.

Sweet, delicately perfumed bulbs—Bianca Di Maggio—offer a crisp, juicy bite with a clean, mild onion character that lingers like fresh-cut green. The small, flattened Cipollini-style shape develops a luminous pale skin and a tender, fine-grained texture that shines in quick, bright preparations and elevates gentle sauces. Grow this 70-day favorite for garden-to-plate charm: reliable sizing, smooth flavor, and a graceful, edible presence from harvest through storage.

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 sweet Cipollini-style onions, avoid drought stress early and harvest once tops flop—then cure briefly before pickling.