SproutSmart
SproutSmart™ Intelligent Garden Sowing

Copra

Onion
Zone 11a Save Garden

Planting Schedule

Add Copra to your garden to build a schedule and get reminders.
Botanical illustration of Copra
100d to harvest

Copra yellow onions open with a bright, honeyed aroma and a crisp, juicy bite that turns sweet and mellow when warmed. The bulbs form a handsome, uniform globe with warm golden skins and tight, fine-textured layers—ideal for everyday use in fresh salads, savory roasts, and slow-simmered sauces, as well as classic pickling for tangy crunch.

Crop Dates

Growing note: In frost-free Zone 11a, grow this cool-season crop during the cooler dry season (October–February).
MilestoneDate
Start Indoors—
ClimateFrost-Free Climate
Transplant / Sow OutdoorsOct 1st
Harvest BeginsJan 9th
Harvest EndsFeb 28th

Crop Details

TraitValue
Days to Maturity100
Sun RequirementsFull SunFull sun
Growth HabitBulbing
Support NeededNone
Planting DepthNormal
Germination Temp (°F)70
Min Soil Temp (°F)45
Min Night Temp (°F)28
Harden Off (days)7

Today's Conditions

Outdoor planting for Copra in Zone 11a typically begins around 2026-10-01. Wait until soil reaches at least 45°F before transplanting Copra.

Garden Alerts

In frost-free Zone 11a, grow this cool-season crop during the cooler dry season (October–February).

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Frequently Asked Questions

What pest or disease is most common on Allium cepa (onions), and how do I treat it at home?
Onions (Allium cepa) are commonly hit by onion maggots and, in humid conditions, downy mildew. To reduce onion maggots, cover seedbeds/transplants with fine insect netting and remove any infested plants immediately; use a soil drench with labeled products if available in your area. For downy mildew, improve airflow and avoid wetting the foliage, then apply a copper-based fungicide early at the first purple/gray downy patches, following the label exactly.
How often should I water Allium cepa during the main growing phase?
During active bulbing (after plants are established and tops are growing), keep the soil evenly moist but not soggy—aim for about 1 inch (2.5 cm) of water per week, adjusted for rainfall and heat. Water deeply so moisture reaches the root zone, and let the top 1–2 inches (2.5–5 cm) of soil dry slightly between waterings to prevent rot and disease.
Botanical illustration of Copra

Copra yellow onions open with a bright, honeyed aroma and a crisp, juicy bite that turns sweet and mellow when warmed. The bulbs form a handsome, uniform globe with warm golden skins and tight, fine-textured layers—ideal for everyday use in fresh salads, savory roasts, and slow-simmered sauces, as well as classic pickling for tangy crunch.

Today's Conditions

Outdoor planting for Copra in Zone 11a typically begins around 2026-10-01. Wait until soil reaches at least 45°F before transplanting Copra.

Garden Alerts

In frost-free Zone 11a, grow this cool-season crop during the cooler dry season (October–February).

Sowing Tips

Soil Temperature

Direct sow or transplant when soil at planting depth holds 45°F for reliable germination and early growth.

Expert Note

For the best storage bulbs, transplant into evenly fertile, weed-free beds when nights are consistently mild and keep watering steady through bulbing, then taper off as tops fall.