Purple Coban

Family: Solanaceae Nightshade

Aromatic and intriguingly tart, Purple Coban tomatillos ripen to a deep, wine-purple glow beneath papery husks—like small lanterns holding their own bright bite.

The fruit’s flesh is juicy and firm with a smooth, slightly seedy texture that bursts with tang when used for bold salsas and vibrant sauces. Grow them for a long harvest window and enjoy their distinctive color as much as their lively flavor in fresh preparations and quick pickling.

Light: Full SunMaturity: 75 DaysHabit: Indeterminate

Planting schedules and alerts are optimized for Columbus (Zone 6b).

Crop Dates

Milestone	Date
Start Indoors	Mar 14th
Last Frost	Apr 25th
Transplant / Sow Outdoors	Jun 20th
Harvest Begins	Sep 3rd
Harvest Ends	Oct 16th

Crop Details

Trait	Value
Days to Maturity	75
Sun Requirements	Full Sun
Growth Habit	Indeterminate
Support Needed	Stake
Planting Depth	Deep
Germination Temp (°F)	75
Min Soil Temp (°F)	60
Min Night Temp (°F)	50
Harden Off (days)	10

Culinary Notes

Chef's Note

Purple Coban tomatillos bring a wine-deep color and a cleaner, more aggressive tang than the average tomatillo—firm enough to hold its shape in salsa and sauces without going watery. Use them for char-and-reduce applications where that bright, slightly seedy bite stays lively against fat and smoke.

Best Uses

quick-pulse salsa verde (keep some seedy texture for body)
charred tomatillo sauce for smoky tacos and enchiladas
fast refrigerator pickles for tangy crunch
reduced pan sauces where the acidity tightens and turns silky

Flavor Profile

sharp, tangy tomatillo acidity juicy, firm flesh that stays cohesive lightly seedy snap and a smooth mouthfeel bright, herbal-aromatic finish

Kitchen Pairings

cilantro lime chile de árbol garlic avocado grilled chicken

Frequently Asked Questions

What pest or disease is most likely on Physalis philadelphica (purple coban), and how can I control it?

Watch for early blight and septoria leaf spot, which cause dark spots that spread quickly on Physalis foliage. Remove badly infected leaves, improve airflow with proper spacing, and water at the soil line (not the leaves). If spots keep progressing, use a labeled fungicide for Solanaceae leaf spot/early blight and repeat according to the label interval.

How often should I water Physalis philadelphica during active growth?

During the main growing phase, keep the soil consistently evenly moist but not soggy—aim for frequent, light watering when the top 1 inch of soil dries. In full sun, that often means about 1–2 times per week, but adjust based on heat and rainfall. Avoid waterlogged conditions because wet soil and humid canopies worsen leaf-spot diseases.

How do I know when purple coban Physalis philadelphica is ready to harvest?

Harvest when the fruit fills the calyx and the papery husk turns from tight green to a deep purple/bronze and feels dry and papery. The fruit should come off the plant easily when gently twisted, and it should taste sweet-tart rather than starchy. Plan to harvest around 75 days from sowing/transplanting, with additional pickings as new husks mature.