Irish Cobbler

Potato

90d to harvest

Velvety-skinned and richly flavored, Irish Cobbler red potatoes bring a satisfying, creamy bite with a subtly sweet, earthy depth. Their russeted-red skins cradle smooth, pale interiors that roast to a golden blush and hold their integrity beautifully for mashing, pan-frying, and hearty stews. A classic Red Potato choice for gardeners who love dependable performance and a harvest that feels abundant from first lift to final basket.

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	May 19th
Transplant / Sow Outdoors	May 19th
Harvest Begins	Aug 17th
Harvest Ends	Sep 21st

Crop Details

Trait	Value
Days to Maturity	90
Sun Requirements	Full Sun
Growth Habit	Clumping
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	55
Min Soil Temp (°F)	45
Min Night Temp (°F)	28
Harden Off (days)	Not Required

Frequently Asked Questions

What pest or disease problem is most common on Solanum tuberosum (Irish potatoes), and how do I manage it?

Late blight is one of the most destructive potato diseases (irregular dark leaf spots with fast spread), especially with cool, wet weather. Remove and destroy infected foliage immediately, avoid overhead watering, and improve airflow by spacing plants; if blight is actively spreading locally, use a labeled fungicide program that targets late blight and follow the label schedule. Watch closely from when plants start flowering (around the mid-season growth stage) because early detection makes the biggest difference.

How often should I water Solanum tuberosum during the main growing phase?

During active tuber bulking (roughly after flowering), keep soil evenly moist but not waterlogged: usually about 1 inch (2.5 cm) of water per week total from rainfall plus irrigation, adjusted for your heat and soil type. Water deeply to wet the ridges and encourage tuber growth, then let the surface dry slightly before watering again; avoid frequent light watering that keeps the root zone constantly wet. If the soil stays soggy after watering, reduce irrigation to prevent rot issues.

How do I tell when Irish Cobbler (Solanum tuberosum) is ready to harvest?

Harvest when plants are fully mature and the tops have yellowed and died back—this typically takes about 90 days from planting for your crop. For a “new potato,” you can dig early for small tubers, but full harvest is after the vines die back and skins firm up. To confirm, gently dig one plant: the tubers should have skins that don’t rub off easily, and the plants should feel less vigorous in the soil.