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How to Grow Celeriac

Celeriac is a root crop, and a member of the Celery family. It has a celery-like taste. The root bulb grows to four inches in diameter or more. Sometimes called "knob celery", most people know little, if anything about Celeriac. Growing Celeriac requires a long growing season, up to 200 days. Due to the long growing season, very few gardeners try it.


Due to it's long growing cycle, Celeriac needs to be started indoors. You will not likely find seedlings at garden supply stores. It may take an Internet search. The seeds are very fine. Sprinkle them on the top of the soil in a pot or container and lightly water them in.

Plant seedlings outdoors after the last frost date for your area.

Space seedlings four to six inches apart in rows 18 to 24 inches apart.

Care and Feeding:

While Celeriac is slow growing, it does not take as much care as it's cousin Celery.

Grow Celeriac plants in rich soil. and full sun. Make sure to keep plants well watered. Fertilize once a month with a general purpose fertilizer.

And, it does not require blanching.

Also See:

Plant Problems

Soil Temperatures

Ideal Soil pH

Days to Maturity: Approximately 200.

Insects and Pests:

Slugs, Carrot Flies and Celery flies can infest Celeriac.


Harvest the small bulbs as they reach a couple inches in diameter, thinning as you harvest. They can grow up to 4 inches in diameter or more. The smaller bulbs will naturally be more tender. If kept in a cool place, Celeriac will keep for several weeks.


Celeriac is susceptible to frost in both the spring and fall.

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