Giant Prague

Celeriac

Zone 10a Save Garden

🌱 120d to harvest Upright

Aromatically rich and luxuriously smooth, Giant Prague celeriac forms large, well-rounded bulbs with a pale, creamy interior that…

Crop Dates

Milestone	Date
Start Indoors	Nov 7th
Last Frost	Jan 16th
Transplant / Sow Outdoors	Jan 9th
Harvest Begins	May 9th
Harvest Ends	Dec 19th

Crop Details

Trait	Value
Days to Maturity	120
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	40
Min Night Temp (°F)	28
Harden Off (days)	7

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Frequently Asked Questions

What pest or disease most commonly affects Apium graveolens var. rapaceum (giant Prague celery root), and how can I fix it?

Celery root is especially prone to early blight/leaf spot and can also get Septoria leaf spot in damp weather. Water the soil only (not the foliage), space plants to keep leaves dry, and remove heavily spotted leaves; if the problem keeps spreading, use a copper-based fungicide according to the label when new spots first appear. Avoid using leftover infected plant debris from previous celery-family crops in the same bed.

How often should I water giant Prague celery root during its main growth phase?

During bulbing and leaf growth (roughly mid-season through about 90–100 days), keep soil evenly moist but not waterlogged—aim for about 1 inch (2.5 cm) per week, adjusted for rainfall and heat. Water deeply after the top 1 inch (2.5 cm) of soil dries; consistent moisture helps form a thick, smooth “celeriac” bulb. Stop short of soggy soil to reduce the risk of rot and foliar diseases.

How do I know when giant Prague celery root is ready to harvest?

Harvest at about 120 days when the bulb is fully swollen and reaches the expected size, with the base of the celery-like stalks firm and well-developed. The best indicator is that the bulb feels solid when you gently press the sides, and the leaves begin to look slightly mature (not limp or actively stretching). Use a garden fork to lift the bulb carefully to avoid damaging the thick roots.

Aromatically rich and luxuriously smooth, Giant Prague celeriac forms large, well-rounded bulbs with a pale, creamy interior that feels dense and velvety in the hand. Its flavor is deep and savory with a gentle celery brightness, making it a standout for roasting, purees, and elegant gratins—also wonderful for braises and hearty soups. Grow this dependable 120-day selection for a bold harvest that stores beautifully and elevates every cool-season meal.

Sowing Tips

Transplant Conditions

Wait until soil reaches 40°F and nights stay above 28°F before moving outdoors. Harden off for 7 days first.

Expert Note

Start celeriac early and transplant only once nights are reliably mild so the roots enlarge instead of bolting or staying small.