Darklet

Family: Apiaceae Root Vegetable

Planting Schedule

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

Sink your spoon into Darklet’s dense, creamy heart—its flavor is richly nutty with a cool, celery-green brightness and a whisper of sweetness.

At maturity, this celeriac forms a broad, knobby crown with smooth, tight flesh that stays pleasantly firm, making it a standout for roasting, puréeing, and velvety sauces. Grow Darklet for a dependable, long-season harvest that rewards patience with a beautifully textured, spoon-ready root.

Light: Part SunMaturity: 120 DaysHabit: Upright

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Darklet 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	Apr 6th	Jun 8th	Oct 6th – Jul 15th
Zone 1b	Mar 23rd	May 25th	Sep 22nd – Aug 1st
Zone 2a	Mar 16th	May 18th	Sep 15th – Aug 29th
Zone 2b	Mar 6th	May 8th	Sep 5th – Aug 25th
Zone 3a	Mar 6th	May 8th	Sep 5th – Sep 1st
Zone 3b	Mar 10th	May 12th	Sep 9th – Sep 21st
Zone 4a	Mar 6th	May 8th	Sep 5th – Sep 24th
Zone 4b	Mar 4th	May 6th	Sep 3rd – Sep 27th
Zone 5a	Feb 27th	May 1st	Aug 29th – Sep 30th
Zone 5b	Feb 23rd	Apr 27th	Aug 25th – Oct 5th
Zone 6a	Feb 20th	Apr 24th	Aug 22nd – Oct 10th
Zone 6b	Feb 14th	Apr 18th	Aug 16th – Oct 16th
Zone 7a	Feb 9th	Apr 13th	Aug 11th – Oct 20th
Zone 7b	Jan 30th	Apr 3rd	Aug 1st – Oct 28th
Zone 8a	Jan 21st	Mar 25th	Jul 23rd – Nov 5th
Zone 8b	Jan 12th	Mar 16th	Jul 14th – Nov 12th
Zone 9a	Dec 26th	Feb 27th	Jun 27th – Nov 26th
Zone 9b	Dec 1st	Feb 2nd	Jun 2nd – 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	120
Sun Requirements	Part Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	40
Min Night Temp (°F)	35
Harden Off (days)	6

Culinary Notes

Chef's Note

Darklet’s dense, tight flesh turns silky without collapsing, so it’s built for a purée that stays cohesive and a roast that eats spoon-first. The cool celery-green and nutty sweetness play beautifully with browned fats and sharp acids—no need to drown it; just let it get golden.

Best Uses

roasted wedges (browned edges, creamy center for spooning)
velvety purée with butter/cream for a clean, cool finish
thick soups or chowders where it holds body without turning gluey
rapid braises or pan-sears of diced celeriac for caramelized edges

Flavor Profile

nutty, celery-green brightness slightly sweet finish dense, spoonable creamy texture with a firm bite

Kitchen Pairings

brown butter garlic black pepper thyme apple cider vinegar Gruyère

Frequently Asked Questions

What pest or disease most commonly affects Apium graveolens var. rapaceum (celeriac), and how do I treat it?

Celery leaf spot and early blight–type leaf diseases can show up as brown spots on leaves, especially in warm, humid weather. Remove any heavily spotted leaves, water at the soil line (not over the foliage), and improve airflow by thinning if plants are crowded. If conditions stay wet, apply a labeled fungicide that’s approved for celery/celeriac use and follow the label timing—repeat only as directed.

How often should I water celeriac during the main growing phase, and what soil moisture level should I maintain?

From when seedlings establish until the bulb/hip starts swelling, keep soil consistently moist but not soggy—aim for the top 1–2 inches to stay evenly damp. In typical home gardens this often means watering about 1–2 times per week, increasing frequency during hot spells, while using enough water to wet the root zone. Avoid letting the soil fully dry out, because irregular moisture can lead to misshapen celeriac and poorer texture.

How can I tell when celeriac (Apium graveolens var. rapaceum) is ready to harvest?

Harvest at about 120 days from sowing/transplanting, or when the celeriac “bulb” reaches a firm, full size with a smooth, well-formed surface. The leaves should look strong and mostly intact; if frost hits, you can harvest right after the first light freezes for best flavor and tenderness. Use a spade to lift carefully and trim roots/leaves promptly to prevent drying.