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Zwolsche Krul

Celery
Zone 1b Save Garden

Planting Schedule

Add Zwolsche Krul to your garden to build a schedule and get reminders.
Botanical illustration of Zwolsche Krul
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: Zone 1b has only 61 frost-free days — shorter than this crop's 80-day maturity. Outdoor planting is not viable; use protected cultivation.
MilestoneDate
Last FrostJun 1st
Growing ApproachProtected Environment Only

Crop Details

TraitValue
Days to Maturity80
Sun RequirementsPart SunPartial sun
Growth HabitRosette
Support NeededNone
Planting DepthNormal
Germination Temp (°F)70
Min Soil Temp (°F)40
Min Night Temp (°F)28
Harden Off (days)6

Today's Conditions

Outdoor planting for Zwolsche Krul in Zone 1b typically begins around Indoor Lights Only. Wait until soil reaches at least 40°F before transplanting Zwolsche Krul.

Garden Alerts

Zone 1b has only 61 frost-free days — shorter than this crop's 80-day maturity. Outdoor planting is not viable; use protected cultivation.

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.
Botanical illustration of Zwolsche Krul

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.

Today's Conditions

Outdoor planting for Zwolsche Krul in Zone 1b typically begins around Indoor Lights Only. Wait until soil reaches at least 40°F before transplanting Zwolsche Krul.

Garden Alerts

Zone 1b has only 61 frost-free days — shorter than this crop's 80-day maturity. Outdoor planting is not viable; use protected cultivation.

Sowing Tips

Soil Temperature

Direct sow or transplant when soil at planting depth holds 40°F for reliable germination and early growth.

Expert Note

Start indoors early, keep seedlings evenly moist, and transplant only when nights are consistently warm so the curly foliage develops without stress.

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