Zwolsche Krul

Celery

80d to harvest

Crisp, cool-green stalks with a clean, bright celery snap—Zwolsche Krul delivers a refined crunch that stays tender even as the season turns. This cutting celery forms sturdy, upright clumps with a tight, flavorful core, ideal for harvesting in succession so your garden keeps offering fresh, fragrant stems. Grow it for its distinctive, refreshing bite and its dependable performance in cool weather—an elegant addition to any home garden bed.

Crop Dates

Growing note: In frost-free Zone 10b, grow this cool-season crop during the cooler dry season (October–February).

Milestone	Date
Start Indoors	—
Climate	Frost-Free Climate
Transplant / Sow Outdoors	Oct 1st
Harvest Begins	Dec 20th
Harvest Ends	Feb 28th

Crop Details

Trait	Value
Days to Maturity	80
Sun Requirements	Part Sun
Growth Habit	Rosette
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	40
Min Night Temp (°F)	28
Harden Off (days)	6

Frequently Asked Questions

What pest or disease commonly hits Apium graveolens var. secalinum (Zwolsche Krul), and what should I do?

A frequent problem is celery leaf spot/early blight type spotting caused by fungi that spread in humid foliage. Water at the soil line, avoid wetting the leaves, and remove heavily spotted leaves early to slow spread. If spots are spreading, use a labeled fungicide for celery/leafy Apiaceae and repeat according to the label interval.

How often should I water Zwolsche Krul during the main growing phase?

During the bulk of the 80-day season, keep the root zone consistently moist but not waterlogged—aim for evenly damp soil down several inches. In part-sun beds, that typically means watering about 1–2 times per week depending on rainfall, with more frequent watering in warm spells. Mulch around plants helps prevent swings that can lead to poor texture and bolting.

How can I tell when Zwolsche Krul is ready to harvest?

Harvest when heads/culms have developed full size for your spacing and the leaves are dense and vigorous, typically around 80 days from sowing/transplanting. A practical check is flavor and tenderness: leaves should be crisp and not bitter, and petioles should feel firm rather than hollow. You can harvest gradually (outer leaves first) to extend picking time without stressing young regrowth.