All Blue

Family: Solanaceae Root Vegetable

Planting Schedule

Provide your location or planting zone to unlock dates and add All Blue to a garden.

All Blue delivers an eye-catching, velvety-deep blue tuber with a creamy, richly colored interior that stays vivid after cooking.

Expect a smooth, medium-firm texture and a pleasantly earthy, nutty flavor that shines in roasted wedges, pan-fried slices, and hearty mashes—plus it’s a standout for color-forward soups and gratins. With about 95 days to maturity, this blue potato is a rewarding garden crop that turns harvest into a true visual delight.

Light: Full SunMaturity: 95 DaysHabit: Upright

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All Blue Planting Dates by USDA Zone

Estimated US hardiness-zone windows for sow, transplant, and harvest. Enter a US ZIP above for exact local dates, or open a zone below.

Zone	Start Indoors	Sow / Transplant	Harvest
Zone 1a	Protected Environment Only
Zone 1b	Protected Environment Only
Zone 2a	Direct Sow	May 25th	Aug 28th – Aug 29th
Zone 2b	Direct Sow	May 15th	Aug 18th – Aug 25th
Zone 3a	Direct Sow	May 15th	Aug 18th – Sep 1st
Zone 3b	Direct Sow	May 19th	Aug 22nd – Sep 21st
Zone 4a	Direct Sow	May 15th	Aug 18th – Sep 24th
Zone 4b	Direct Sow	May 13th	Aug 16th – Sep 27th
Zone 5a	Direct Sow	May 8th	Aug 11th – Sep 30th
Zone 5b	Direct Sow	May 4th	Aug 7th – Oct 5th
Zone 6a	Direct Sow	May 1st	Aug 4th – Oct 10th
Zone 6b	Direct Sow	Apr 25th	Jul 29th – Oct 16th
Zone 7a	Direct Sow	Apr 20th	Jul 24th – Oct 20th
Zone 7b	Direct Sow	Apr 10th	Jul 14th – Oct 28th
Zone 8a	Direct Sow	Apr 1st	Jul 5th – Nov 5th
Zone 8b	Direct Sow	Mar 23rd	Jun 26th – Nov 12th
Zone 9a	Direct Sow	Mar 6th	Jun 9th – Nov 26th
Zone 9b	Direct Sow	Feb 9th	May 15th – Dec 9th
Zone 10a	Continuous Production
Zone 10b	Continuous Production
Zone 11a	Continuous Production
Zone 11b	Continuous Production
Zone 12a	Continuous Production
Zone 12b	Continuous Production
Zone 13a	Continuous Production
Zone 13b	Continuous Production

Crop Details

Trait	Value
Days to Maturity	95
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)	35
Harden Off (days)	Not Required

Culinary Notes

Chef's Note

All Blue’s creamy, medium-firm tuber gives you that classic potato satisfaction—crisp outside, yielding inside—while keeping its blue tone vivid instead of turning muddy. It’s especially worth using when you want the color to be part of the dish, like in gratins or thick soups where the starch has time to thicken.

Best Uses

hot, crisp roasted wedges that stay structured inside
pan-fried slices for a golden crust and creamy center
hearty mash where the color stays blue-purple on the plate
color-forward soups and gratins where it won’t dull

Flavor Profile

earthy, nutty potato flavor smooth, medium-firm bite creamy interior that holds vivid color when cooked slight sweetness on the finish

Kitchen Pairings

garlic black pepper butter gruyère fresh thyme smoked paprika

Frequently Asked Questions

How do I manage powdery mildew on All Blue (about 95 days) when it shows up on my foliage?

Look for white, powdery patches on leaves and stems, usually starting midseason on plants grown in dense growth. Remove the worst affected leaves, improve airflow by spacing and pruning nonessential foliage, and water at the soil line so leaves stay dry. If it keeps spreading, spray a labeled potassium bicarbonate or sulfur product and repeat as directed, especially after humid stretches.

How often should I water All Blue during its main growing phase to keep tubers developing well?

During the main growth period (roughly after plants are established and until near maturity), keep soil evenly moist but not soggy—about 1 inch of water per week, split into 2–3 waterings during hot weather. Check by digging 2–3 inches down: if it feels dry at that depth, water; if it’s muddy, hold off and let it dry slightly to avoid rotting.

When are All Blue tubers ready to harvest, and what signs should I look for?

Harvest at about 95 days from planting when the plants begin to yellow and most foliage has died back, and the tuber skins feel firm and not rub off easily. For a final check, gently dig one plant to confirm tuber size and skin set. Avoid harvesting right after heavy rain—aim for dry conditions so skins cure better and storage lasts longer.