Zwolsche Krul

Family: Apiaceae Herb

Planting Schedule

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

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.

Light: Part SunMaturity: 80 DaysHabit: Rosette

Location not set yet

Enter your ZIP for local crop dates

Zwolsche Krul 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	Mar 30th	May 18th	Aug 6th – Aug 29th
Zone 2b	Mar 20th	May 8th	Jul 27th – Aug 25th
Zone 3a	Mar 20th	May 8th	Jul 27th – Sep 1st
Zone 3b	Mar 24th	May 12th	Jul 31st – Sep 21st
Zone 4a	Mar 20th	May 8th	Jul 27th – Sep 24th
Zone 4b	Mar 18th	May 6th	Jul 25th – Sep 27th
Zone 5a	Mar 13th	May 1st	Jul 20th – Sep 30th
Zone 5b	Mar 9th	Apr 27th	Jul 16th – Oct 5th
Zone 6a	Mar 6th	Apr 24th	Jul 13th – Oct 10th
Zone 6b	Feb 28th	Apr 18th	Jul 7th – Oct 16th
Zone 7a	Feb 23rd	Apr 13th	Jul 2nd – Oct 20th
Zone 7b	Feb 13th	Apr 3rd	Jun 22nd – Oct 28th
Zone 8a	Feb 4th	Mar 25th	Jun 13th – Nov 5th
Zone 8b	Jan 26th	Mar 16th	Jun 4th – Nov 12th
Zone 9a	Jan 9th	Feb 27th	May 18th – Nov 26th
Zone 9b	Dec 15th	Feb 2nd	Apr 23rd – Dec 9th
Zone 10a	—	Oct 1st	Dec 20th – Feb 28th
Zone 10b	—	Oct 1st	Dec 20th – Feb 28th
Zone 11a	—	Oct 1st	Dec 20th – Feb 28th
Zone 11b	—	Oct 1st	Dec 20th – Feb 28th
Zone 12a	—	Oct 1st	Dec 20th – Feb 28th
Zone 12b	—	Oct 1st	Dec 20th – Feb 28th
Zone 13a	—	Oct 1st	Dec 20th – Feb 28th
Zone 13b	—	Oct 1st	Dec 20th – 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

Culinary Notes

Chef's Note

Zwolsche Krul’s defining trait is a crisp, tight-core crunch that doesn’t collapse when chopped small or dressed quickly. It’s at its best when you keep heat gentle or use bright acid/pickling so that celery snap stays front and center.

Best Uses

thinly sliced for crunchy crudités and chopped salads
swift pickles/brines where the stalk keeps a snappy bite
jazzed-up mirepoix base (light cooking, not long simmering)
stock for a clear, aromatic backbone—then strain

Flavor Profile

bright celery snap clean, cool-green aromatics tight, tender stalk crunch

Kitchen Pairings

lemon butter parmesan chickpeas chicken olives

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.