Celeriac, or celery root (Apium graveolens var. rapaceum), is a cool-season vegetable native to temperate Mediterranean regions that grows a distinctive swollen root prized for its subtle celery flavor. This biennial to perennial crop reaches 24-36 inches tall in full sun across zones 3-6, thriving in consistently moist, rich soil with regular feeding. Unlike its leafy cousin, celeriac demands patience and attention to detail, but rewards careful gardeners with a versatile root vegetable that stores well through winter.
Full Sun
Moderate
3-6
36in H x 18in W
—
High
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Celeriac's aromatic pinnately divided foliage and bulbous edible root make it visually and culinarily distinct among root crops. The plant thrives within a narrow sweet spot of 60-75°F growing temperatures and dislikes both cold snaps below 55°F (which trigger bolting) and summer heat, demanding a gardener's genuine commitment to its preferences. A Mediterranean native that can naturalize through self-seeding, it combines ornamental appeal with serious culinary potential for those willing to provide consistent moisture, rich soil, and regular fertilization.
Celeriac serves as a versatile root vegetable harvested for its bulbous, starch-filled root that develops at soil level. The plant is grown as an annual vegetable crop, with both the root and aromatic foliage contributing to its culinary appeal across European cuisines where it appears in soups, purees, slaws, and roasted preparations.
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Start seeds indoors 8-10 weeks before your last spring frost, maintaining soil temperature at 60-75°F for reliable germination. Transplant seedlings into individual containers once they develop true leaves, continuing to provide warmth and consistent moisture.
Transplant hardened-off seedlings into the garden after the last frost date when soil has warmed and nighttime temperatures consistently remain above 55°F to prevent bolting. Space plants 6-8 inches apart in rows 12-18 inches wide, allowing room for the root bulb to expand.
Harvest celeriac roots in fall, typically 100-120 days after transplanting, when the bulbous root reaches 2-3 inches in diameter at soil level. Gently loosen soil around the base and pull the entire plant, inspecting the root for firmness and checking that the crown feels dense and substantial. In mild climates, you can leave roots in the ground and harvest as needed, or mulch heavily to extend the harvest season. Cut away the fibrous crown and foliage before storage.
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“Apium graveolens var. rapaceum traces its ancestry to temperate Mediterranean regions of Europe, Asia, and Africa, where wild populations established the genetic foundation for modern cultivated varieties. This botanical variety represents a deliberate selection within the broader Apium graveolens species, which also gave rise to common celery and leaf celery. The domestication of celeriac as a distinct food crop reflects centuries of Mediterranean and European horticultural refinement, transforming a wild herb into a valued root vegetable adapted to cool-season agriculture.”