SproutSmart
SproutSmart™ Intelligent Garden Sowing

Gold Coin

Onion
Zone 1b Save Garden

Planting Schedule

Add Gold Coin to your garden to build a schedule and get reminders.
Botanical illustration of Gold Coin
90d to harvest

Sweet, golden bulbs with a delicate, honeyed aroma—Gold Coin Cipollini onions form perfectly round “coin” shapes that feel satiny in the hand and roast up tenderly with a mellow depth. The flesh is crisp yet yielding, with a gentle bite that shines in fresh slices and shines again when caramelized for rich, glossy sauces. Grow Gold Coin for a harvest that’s as beautiful on the counter as it is inspiring in the garden at 90 days.

Crop Dates

Growing note: Zone 1b has only 61 frost-free days — shorter than this crop's 90-day maturity. Outdoor planting is not viable; use protected cultivation.
MilestoneDate
Last FrostJun 1st
Growing ApproachProtected Environment Only

Crop Details

TraitValue
Days to Maturity90
Sun RequirementsFull SunFull sun
Growth HabitBulbing
Support NeededNone
Planting DepthNormal
Germination Temp (°F)70
Min Soil Temp (°F)40
Min Night Temp (°F)28
Harden Off (days)7

Today's Conditions

Outdoor planting for Gold Coin in Zone 1b typically begins around Indoor Lights Only. Wait until soil reaches at least 40°F before transplanting Gold Coin.

Garden Alerts

Zone 1b has only 61 frost-free days — shorter than this crop's 90-day maturity. Outdoor planting is not viable; use protected cultivation.

Recommended Companions

Kuroda Carrot
View Details →
Kestrel Beet
View Details →
New Red Fire Lettuce
View Details →
Adelaide Carrot
View Details →
Kalura Lettuce
View Details →
White Detroit Beet
View Details →

Frequently Asked Questions

What pest or disease commonly affects Allium cepa (gold coin cipollini onions), and what should I do?
Watch for onion thrips and downy mildew, which often show up as silvery streaking on leaves or fuzzy gray/purple growth and yellowing. Remove any badly infected foliage, avoid overhead watering, and space plants so leaves dry quickly after rain; for thrips, rinse leaves with a strong water jet and use insecticidal soap when thrips are actively feeding. If downy mildew persists, apply an appropriate labeled fungicide and keep the bed free of volunteer onion-family plants that can harbor disease.
How can I tell when gold coin cipollini onions (Allium cepa) are ready to harvest?
Harvest when about half the leaves have fallen over and the remaining leaves are drying, typically around 90 days. Stop watering once leaves start collapsing so skins can dry and toughen; lift bulbs gently to avoid bruising and cure them in a dry, airy place out of direct sun for 1–2 weeks. Onions are ready for storage when outer skins are papery and necks feel dry.
Botanical illustration of Gold Coin

Sweet, golden bulbs with a delicate, honeyed aroma—Gold Coin Cipollini onions form perfectly round “coin” shapes that feel satiny in the hand and roast up tenderly with a mellow depth. The flesh is crisp yet yielding, with a gentle bite that shines in fresh slices and shines again when caramelized for rich, glossy sauces. Grow Gold Coin for a harvest that’s as beautiful on the counter as it is inspiring in the garden at 90 days.

Today's Conditions

Outdoor planting for Gold Coin in Zone 1b typically begins around Indoor Lights Only. Wait until soil reaches at least 40°F before transplanting Gold Coin.

Garden Alerts

Zone 1b has only 61 frost-free days — shorter than this crop's 90-day maturity. Outdoor planting is not viable; use protected cultivation.

Sowing Tips

Soil Temperature

Direct sow or transplant when soil at planting depth holds 40°F for reliable germination and early growth.

Expert Note

For sweet cipollini-type onions, keep soil evenly moist early and avoid nitrogen excess so bulbs size up without getting pungent.