Blue Belle

Potato

90d to harvest

Silky-skinned Blue Belle potatoes reveal a cool, slate-blue interior that’s as alluring as it is delicious—creamy and richly flavored with a gentle, nutty depth. Expect a firm, smooth texture that holds its shape beautifully, making these blue potatoes a standout for roasting and pan-frying, while their striking color also shines in mashes, soups, and vibrant salads. A true showpiece from the garden to the plate, Blue Belle brings rare color and dependable harvests to home growers.

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	Spreading
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

How do I prevent and treat gray mold (Botrytis) on Blue Belle (90-day) plants?

Gray mold shows up as fuzzy gray growth on leaves, flowers, or berries—usually when plants stay wet and airflow is poor. Remove and discard affected parts immediately, then thin foliage so clusters aren’t touching and water at the soil line (not over the plants). If it keeps recurring, spray a registered fungicide labeled for your berry/crop (follow label intervals), and stop using overhead watering until dry weather returns.

How often should I water Blue Belle during the main growing season to keep berries sweet and avoid disease?

During the main growing phase (roughly the mid-season after plants are established), water deeply about 1–2 times per week, aiming for evenly moist soil 6–8 inches down. Check before watering: if the top 1 inch of soil is dry, soak until it drains, but don’t leave the bed soggy or water daily. During hot spells, you may need more frequent deep soakings to prevent wilting and poor berry fill—always prioritize soil moisture over a fixed schedule.

How can I tell when Blue Belle is ready to harvest?

Harvest when berries turn fully blue and have a waxy “bloom” and firm, springy flesh—no red or pink remaining at the blossom end. Taste-test a few: Blue Belle is ready when berries are sweet with balanced acidity (often 90 days from planting, depending on start date and transplant timing). Pick in cool hours and handle gently; berries will release easily when ripe.