King Edward

Potato

90d to harvest

Silky-skinned and richly flavored, King Edward potatoes bring a luminous, creamy-white tuber with a fine, even texture that feels almost velvety in the hand. Expect a dependable, all-season harvest in about 90 days, with tubers that roast to a golden crust and turn tender and fluffy for mashing, as well as beautifully suited to hearty stews and gratins. A classic white potato for gardeners who want dependable performance and a refined, comforting bite.

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	May 15th
Transplant / Sow Outdoors	May 15th
Harvest Begins	Aug 13th
Harvest Ends	Aug 25th

Crop Details

Trait	Value
Days to Maturity	90
Sun Requirements	Full Sun
Growth Habit	Upright
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’s the most common disease to watch for on Solanum tuberosum (potatoes) and how do I manage it?

Watch for late blight (often starts as dark, greasy-looking leaf spots that spread quickly in cool, humid weather). Remove and bag infected foliage immediately, avoid overhead watering, and water at the soil line; if it’s spreading, use a labeled late-blight fungicide early and repeat as directed. Also plant in well-drained soil and don’t work the plants when leaves are wet to reduce spread.

How often should I water King Edward potatoes during their main growth?

During active foliage growth, keep the soil evenly moist but not waterlogged—about 1 inch (2.5 cm) per week total, adjusted for rainfall and your soil’s drainage. Water deeply after checking the row: the top 2–3 inches should feel slightly dry before the next watering, but the ridge should still hold moisture. Once tubers begin swelling, irregular dry spells followed by heavy watering can lead to misshapen tubers, so aim for steady moisture.

How can I tell when to harvest Solanum tuberosum ‘King Edward’?

Harvest when the plants’ tops have died back and the tuber skins have set—typically around 90 days, but use the foliage as your main cue. In the final week, stop watering and gently dig one plant to test: the skin should resist rubbing off. Cure freshly harvested tubers in a cool, dark, airy place for about 1–2 weeks before storage.