Kennebec

Potato

90d to harvest

Creamy, buttery flesh with a clean, mellow flavor—Kennebec white potatoes deliver a satisfying bite and dependable texture you’ll want to grow again and again. At harvest, the tubers form with smooth, light skin and an appealing oval shape, holding their integrity for hearty, golden results and comforting classics. A favorite for home cellars and everyday favorites, Kennebec shines wherever you want reliable performance from planting to 90-day maturity.

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	Apr 20th
Transplant / Sow Outdoors	Apr 20th
Harvest Begins	Jul 19th
Harvest Ends	Oct 20th

Crop Details

Trait	Value
Days to Maturity	90
Sun Requirements	Full Sun
Growth Habit	Mounding
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	50
Min Soil Temp (°F)	45
Min Night Temp (°F)	28
Harden Off (days)	Not Required

Frequently Asked Questions

What pest or disease is most likely to hit Solanum tuberosum (potato) and how can I manage it at home?

Early blight (Alternaria) is a common home-garden problem, showing up as dark, target-like spots on older potato leaves. Remove and destroy affected foliage early, improve airflow by keeping plants appropriately hilled, and rotate away from potatoes/other Solanaceae in future seasons. If wet weather persists, use a labeled fungicide appropriate for potatoes and follow the label’s reapplication interval.

How often should I water Solanum tuberosum during the main growing phase to keep tubers forming well?

During active tuber bulking (roughly mid-season), keep the soil evenly moist—about 1–2 inches of water per week total, adjusted for rainfall. Water deeply so moisture reaches the hilled root zone, and avoid letting soil dry out completely between waterings. Inconsistent moisture can lead to misshapen tubers, so aim for steady conditions rather than frequent light sprinkling.

How do I tell when Kennebec potatoes (Solanum tuberosum) are ready to harvest?

Harvest at about 90 days when the plants’ vines begin to die back and the skins are set—test by gently rubbing a tuber; the skin should not rub off easily. For fresh eating, you can dig a few earlier, but for best storage harvest after the foliage has substantially senesced and plants are dry. Dig carefully to avoid cuts, and cure the harvested potatoes in a cool, dark, ventilated place before storage.