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Celeriac
Celeriac
Celeriac
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Celeriac
A celeriac hypocotyl sliced in half, and with the greens removed
GenusApium
SpeciesApium graveolens
Cultivar groupRapaceum Group or Celeriac Group[1]
Cultivar group members
  • Bergers White Ball
  • Diamant
  • Giant Prague
  • Goliath
  • Ibis
  • Kojak
  • Monarch
  • Monet F1
  • Prinz
  • Snow White[2][3]

Celeriac (Apium graveolens Rapaceum Group, synonyms Apium graveolens Celeriac Group and Apium graveolens var. rapaceum),[1] also called celery root,[4] knob celery,[5] and turnip-rooted celery[6] (although it is not a close relative of the turnip), is a group of cultivars of Apium graveolens cultivated for their edible bulb-like hypocotyl, and shoots.

Celeriac is widely cultivated in the Mediterranean Basin and in Northern Europe.[3][6] It is also but less commonly cultivated in North Africa, Siberia, Southwest Asia, and North America.[3][7]

History

[edit]

Wild celery (Apium graveolens), from which both celeriac and celery derive, originated in Europe and the Mediterranean Basin.[8][3] It was mentioned in the Iliad[9] and Odyssey[10][11] as selinon.[notes 1] Celeriac was grown as a medicinal crop in some early civilizations.[10][12]

Culinary use

[edit]
Wikibooks Cookbook has a recipe/module on
Celeriac harvested for eating

Typically, celeriac is harvested when its hypocotyl is 10 to 14 centimetres (4 to 5+1⁄2 inches) in diameter.[7] This is white on the inside, and can be kept for months in winter. It often serves as a key ingredient in soup. It can also be shredded and used in salads. The leaves are used as seasoning; the small, fibrous stalks find only marginal use.[3]

The shelf life of celeriac is approximately six to eight months if stored between 0 and 5 °C (32 and 41 °F), and not allowed to dry out.[13] However, the vegetable will tend to rot through the centre if the finer stems surrounding the base are left attached. The centre of celeriac becomes hollow as it ages, though even freshly harvested celeriacs can have a small medial hollow.[13] The freshness will also be obvious from the taste; the older it is, the weaker the celery flavour.[citation needed]

Celeriac (raw)
Nutritional value per 100 g (3.5 oz)
Energy176 kJ (42 kcal)
9.2 g
Sugars1.6 g
Dietary fibre1.8 g
0.3 g
1.5 g
Vitamins and minerals
VitaminsQuantity
%DV†
Thiamine (B1)
4%
0.05 mg
Riboflavin (B2)
5%
0.06 mg
Niacin (B3)
4%
0.7 mg
Pantothenic acid (B5)
7%
0.352 mg
Vitamin B6
10%
0.165 mg
Vitamin C
9%
8 mg
Vitamin K
34%
41 μg
MineralsQuantity
%DV†
Calcium
3%
43 mg
Iron
4%
0.7 mg
Magnesium
5%
20 mg
Manganese
7%
0.158 mg
Phosphorus
9%
115 mg
Potassium
10%
300 mg
Sodium
4%
100 mg
Zinc
3%
0.33 mg
Other constituentsQuantity
Water88 g
Link to USDA Database entry
†Percentages estimated using US recommendations for adults,[14] except for potassium, which is estimated based on expert recommendation from the National Academies.[15]

See also

[edit]

Explanatory notes

[edit]

References

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Celeriac

View on Grokipedia
from Grokipedia
Celeriac (Apium graveolens var. rapaceum), commonly known as celery root or knob celery, is a biennial plant in the Apiaceae family, closely related to celery, carrots, parsley, and parsnips. It is cultivated primarily for its enlarged, globular root, which develops as a swollen hypocotyl with a rough, knobby, light brown exterior and firm, white to cream-colored starchy flesh inside. The root typically measures 3 to 4 inches (8-10 cm) in diameter at maturity and has a mild, earthy flavor blending celery's herbal notes with subtle nuttiness and parsley-like undertones. The plant's dark green leaves and stems are also edible but secondary to the root, which requires peeling due to its tough rind comprising up to 25% of the vegetable's weight. Celeriac is a variety of celery (Apium graveolens) originating from the Mediterranean region. While wild celery was valued in ancient Egypt, Greece, and Rome for medicinal and religious purposes, celeriac was first recorded as a cultivated root vegetable in 16th-century Europe, gaining popularity in gardens by that time and through selective breeding in the following centuries producing modern varieties. Today, it remains a staple in temperate climates across Europe and North America. In culinary applications, celeriac's versatility shines when peeled and prepared raw—grated into salads or remoulades for a crisp texture—or cooked through roasting, boiling, mashing, or pureeing in soups, stews, and gratins, where its subtle flavor complements richer ingredients. The leaves serve as a fresh herb for seasoning, similar to parsley. Nutritionally, raw celeriac is low in calories at 42 kcal per 100 grams, providing 9.2 grams of carbohydrates (including 1.8 grams of fiber), 1.5 grams of protein, and minimal fat (0.3 grams), alongside notable levels of vitamin C (8 mg), vitamin K (41 µg), potassium (300 mg), phosphorus (115 mg), and calcium (43 mg).

Taxonomy and botany

Classification

Celeriac is classified under the binomial nomenclature Apium graveolens var. rapaceum (Rapaceum Group), a variety within the species Apium graveolens. This nomenclature reflects its status as a cultivated form selected for its enlarged hypocotyl, distinguishing it from other varieties in the same species. Belonging to the genus Apium, celeriac shares close relations with other members of the Apiaceae family, commonly known as the carrot or parsley family, which includes aromatic herbs and root vegetables like carrots and parsnips. Key species distinctions within the genus highlight Apium graveolens var. dulce (Dulce Group), cultivated primarily for its edible stalks as common celery, and var. secalinum (Secalinum Group), known as leaf celery or Chinese celery for its foliage. These varieties demonstrate the selective breeding within Apium graveolens for different plant parts. Evolutionarily, celeriac derives from the wild progenitor Apium graveolens L., a marshland plant native to the Mediterranean region, where it was first domesticated through selection for root enlargement. As a distinct cultivar group, it is formally recognized by botanical authorities including the United States Department of Agriculture (USDA) and taxonomic databases such as the National Center for Biotechnology Information (NCBI) Taxonomy (ID 4045 for the species).

Morphology and growth

Celeriac (Apium graveolens var. rapaceum) is a biennial herb in the Apiaceae family, typically grown as an annual for its edible hypocotyl, reaching a vegetative height of 20–40 cm with erect, ribbed stems supporting a rosette of compound, feathery green leaves. The leaves are aromatic and celery-like, divided into segments, while the thin stalks are edible but often fibrous and less palatable. The defining morphological feature is the swollen hypocotyl, a bulbous enlargement of the stem base located at and partially below the soil surface, which develops into a knobby, turnip-shaped structure up to 10–14 cm in diameter with a rough brown exterior textured by numerous small rootlets. Internally, the hypocotyl features creamy white flesh with a mild celery-like aroma, structured around vascular bundles similar to those in celery petioles, consisting of xylem and phloem tissues that facilitate nutrient transport. In its natural biennial life cycle, celeriac completes vegetative growth in the first year, followed by bolting and reproduction in the second if not harvested, producing umbels of small, pale white hermaphroditic flowers pollinated by insects from June to August, which develop into seeds. The plant's overall form remains compact during cultivation, with the leaf rosette crowning the hypocotyl and minimal above-ground stem elongation unless bolting occurs. Distinctive traits include the hypocotyl's irregular, knobby surface resulting from adventitious rootlets, and its firm, crisp texture that resists splitting under optimal conditions. The growth cycle begins with seed germination, which takes 10–21 days under warm conditions of 21–24°C and requires light exposure and consistent moisture for optimal emergence. Seedlings develop slowly into robust plants over 100–140 days of vegetative growth, with the hypocotyl swelling primarily during cooler periods of 10–20°C that promote cell expansion and flavor development without inducing bolting. This extended timeline reflects celeriac's preference for cool-season conditions, where the plant establishes a deep taproot system alongside the enlarged hypocotyl, ensuring resilience to light frost while prioritizing underground storage organ formation over rapid top growth.

History

Origins and early uses

The wild ancestor of celeriac is Apium graveolens, a biennial herb native to marshy, saline soils in the Mediterranean Basin, where it has been documented growing since ancient times. This species, commonly known as wild celery or smallage, thrived in wetland environments across southern Europe, North Africa, and western Asia, serving as the progenitor for later cultivated varieties like celeriac. The earliest written references to a plant akin to celery appear in ancient Greek literature as "selinon," mentioned in Homer's Iliad (Book 2, line 776) and Odyssey (Book 5, line 72), dating to approximately the 8th century BCE. In these epics, selinon is depicted in lush, natural settings—such as horses grazing on it or growing in a divine cave—highlighting its familiarity in the Mediterranean landscape, though without explicit culinary context. Early uses emphasized its medicinal properties, including as a diuretic to promote urine flow and a sedative to alleviate inflammation, such as in cases of swollen tissues. In ancient Egyptian culture, celery leaves (Apium graveolens) were incorporated into funerary wreaths and garlands, symbolizing eternity and placed with the deceased in tombs during the New Kingdom (c. 14th century BCE), as evidenced by findings in Tutankhamun's tomb. Among the Greeks and Romans, the plant gained prominence for therapeutic applications; Pliny the Elder, in his Natural History (Book 20, 1st century CE), detailed selinon as a remedy for stomach pains, flatulence, and digestive disorders when consumed in decoctions or as seeds. Before widespread domestication, celery was valued primarily for its aromatic and medicinal qualities rather than as a staple food, with applications in rituals, garlands, and herbal remedies across the region. Archaeological evidence, including schizocarps and seed remains from sites in classical Greece and Roman Italy—such as those at Mutina (modern Modena) and other Vesuvian-area excavations—confirms its pre-agricultural role in medicinal preparations and ceremonial contexts, dating from the 1st millennium BCE onward.

Domestication and spread

Celeriac (Apium graveolens var. rapaceum) emerged through selective breeding from wild celery in 16th-century Italy, with efforts focusing on enlarging the hypocotyl to reduce bitterness and enhance edibility for culinary use. The first documented cultivation records appear in 16th-century Europe, including mentions of related celery forms in English herbalist William Turner's 1548 text The Names of Herbes, marking its integration into garden practices. By the Renaissance, it gained popularity in France and Italy, with French botanists documenting its food use around 1600 CE and the first explicit record as a culinary plant in France in 1623. This era saw refined breeding in these regions, establishing celeriac as a staple in European diets. Following its 16th-century domestication, celeriac spread northward through Europe, gaining value for sustenance and medicinal properties in regions like Poland and Central Europe. The vegetable's global expansion accelerated in the , reaching via European immigrants who introduced it to gardens and markets. In the , cultivation extended to and , particularly southwestern and , driven by colonial and agricultural . Today, major producers include the , , , and , with the harvesting approximately 429,000 tons annually across 12,110 hectares as of 2022. Post-2000s, interest revived in organic farming circles, with growers noting increased demand for its nutrient-dense profile and versatility in sustainable systems, aligning with broader trends in heirloom vegetable cultivation.

Cultivation

Requirements and methods

Celeriac thrives in cool temperate climates with optimal daytime temperatures ranging from 10 to 21°C (50 to 70°F), where it can complete its growth cycle without excessive stress. It is frost-tolerant, enduring light frosts down to -2°C (28°F), but requires a growing season of 100 to 120 days from transplanting to harvest. Prolonged exposure to cold—such as nights below 4°C (40°F) and days below 10–13°C (50–55°F) for more than 10 days—can trigger bolting, leading to premature flowering and reduced root development. While it tolerates mild coastal conditions up to 24°C (75°F), temperatures exceeding this can cause heat stress, slowing growth and increasing susceptibility to pests. The plant demands fertile, well-drained loamy soils rich in organic matter to support its shallow root system and consistent nutrient uptake. Ideal soil pH ranges from 6.0 to 7.0, with consistent moisture essential to prevent cracking or stunted roots, though waterlogging must be avoided to prevent rot. Amending soil with compost or aged manure prior to planting enhances fertility and improves drainage, particularly in heavier clay soils where celeriac may otherwise struggle. Planting begins with starting seeds indoors 10 to 12 weeks before the last expected frost, as germination is slow and erratic, taking 2 to 3 weeks at soil temperatures of 21 to 24°C (70 to 75°F). Seedlings should be transplanted outdoors 1 to 2 weeks before the last frost, once they reach 5 to 8 cm (2 to 3 inches) tall, into full sun or partial shade with spacing of 15 to 30 cm (6 to 12 inches) between plants and 45 to 90 cm (18 to 36 inches) between rows. Direct sowing is possible 2 to 3 weeks before the last frost but less reliable due to poor germination in cooler soils. Ongoing care focuses on maintaining even moisture and fertility to promote uniform root swelling. Apply mulch, such as straw or organic material, around plants to retain soil moisture and suppress weeds, aiming for 2.5 to 4 cm (1 to 1.5 inches) of water per week, supplemented by irrigation during dry periods. Fertilize with a balanced NPK formula, such as 5-10-10, at planting, followed by side-dressing with nitrogen (e.g., 0.05 kg per 10 square meters mid-season) to support vegetative growth without excess that could attract pests. Regular weeding is crucial, as competition can hinder development; for pest control, use row covers to deter carrot rust flies and aphids, while monitoring for leafhoppers and thrips, which can be managed with insecticidal soaps if infestations occur. Key challenges include the crop's extended growing period, which demands patience and precise timing in shorter seasons, and vulnerability to diseases such as Septoria leaf spot (late blight), which thrives in humid conditions and causes yellowing foliage. Crop rotation every 3 to 4 years, use of disease-free seeds, and sanitation practices like removing debris help mitigate these risks, though high humidity or poor airflow can exacerbate issues. Inconsistent watering may lead to root cracking, underscoring the need for vigilant irrigation management.

Varieties

Celeriac (Apium graveolens var. rapaceum) cultivars differ in root size, skin smoothness, flavor profile, bolting resistance, and adaptation to environmental stresses, allowing growers to select based on climate, space, and production goals. In cooler climates, bolt-resistant varieties are preferred to minimize premature flowering triggered by early cold exposure, while commercial producers often prioritize uniform shapes for easier processing and storage. 'Monarch' is a high-quality cultivar producing smooth-skinned, round roots typically measuring 10-12 cm in diameter with a creamy white interior and subtle nutty flavor. It exhibits uniformity, making it ideal for home gardens and yielding reliably under moderate conditions. 'Brilliant' yields medium-large, relatively smooth round roots up to 13-15 cm across, featuring buff-colored skin, white flavorful flesh that resists pithiness and hollow heart, and a rich celery taste. This early-maturing variety stores well and is popular in European commercial cultivation for its vigor and productivity. ' Giant Prague', an heirloom introduced in the 19th century, develops exceptionally large knobby roots reaching 15-20 cm in with a robust flavor and firm texture. It requires a of 110-120 days and suits temperate regions but has a rougher exterior that demands more . Other notable cultivars include 'Bergers White Ball', a compact early-maturing type with globe-shaped white roots suited to smaller plots and fresh consumption or storage. '', an , offers mild flavor, good disease resistance, and reduced bolting tendency, performing well in varied soils and cooler adaptations.

Harvesting and storage

Celeriac is typically harvested 100 to 120 days after transplanting, when the hypocotyl has reached a diameter of 3 to 4 inches (8 to 10 cm) and the shoulders begin to emerge above the soil surface. Harvesting should occur in late summer through fall, ideally before the first hard freeze to maintain tenderness, though a light frost can enhance flavor. For optimal quality, avoid delaying harvest until after heavy frost, as this can lead to tougher texture. Harvesting techniques involve cutting the at its base with a sharp to avoid damaging the , then removing excess and trimming outer leaves while leaving about 1 inch of foliage to in storage. Rootlets should be trimmed to minimize moisture loss, and the roots can be cured in a shaded area for 1 to 2 days to heal cut surfaces and prevent entry points for pathogens. In commercial settings, celeriac is often harvested mechanically in rows for efficiency, with yields typically ranging from 10 to 20 tons per acre depending on variety and growing conditions. Individual plant yields vary but can reach 1 to 2 kg for well-grown specimens in optimal soil. For storage, celeriac requires cool temperatures of 0 to 5°C (32 to 41°F) and high relative humidity of 90 to 98% to prevent shriveling and maintain quality. Roots should be stored with some soil or roots intact, packed in damp sand, sawdust, or perforated bags to ensure good air circulation while retaining moisture; wrapping in a damp cloth is also effective for smaller quantities. Under these conditions, celeriac can last 6 to 8 months without significant loss of firmness or flavor. Post-harvest issues include susceptibility to soft rot if excess moisture accumulates, so regular inspection and ventilation are essential to avoid decay. Freezing injury occurs below -1°C, and low humidity leads to drying out.

Culinary uses

Preparation and cooking

Celeriac requires careful preparation due to its knobby, tough exterior. To clean it, scrub the surface under running water to remove dirt, then use a sharp chef's knife to cut off the top and bottom for stability. Peel the skin vertically in strips using a vegetable peeler or paring knife, discarding the outer layer which can account for about a quarter of the vegetable's weight. After peeling, rinse the white flesh and cut out any woody central core to avoid bitterness in the final dish. To prevent enzymatic browning, which discolors the exposed flesh quickly, immediately rub the cut surfaces with lemon or submerge the pieces in a bowl of water acidulated with lemon juice or white wine vinegar. Once prepared, cut celeriac can be refrigerated in an airtight container or plastic bag for 3 to 5 days, though quality diminishes after a week. Raw celeriac offers a crisp texture similar to jicama and a mild, nutty celery flavor, making it suitable for salads when grated or julienned. It can be mixed into slaws or remoulades without cooking, providing freshness and crunch. For cooked preparations, celeriac can be boiled or steamed until tender, typically requiring minutes in boiling . enhances its sweetness; the peeled , toss with , and bake at 180–200°C for to 40 minutes until golden and soft. It purees smoothly like mashed potatoes when boiled and blended with , , or , yielding a creamy consistency. Diced celeriac adds body and thickening to soups and stews due to its starch content, while blanched leaves and stalks can serve as a seasoning similar to celery greens.

Regional dishes

In French cuisine, celeri remoulade is a classic preparation featuring raw, finely shredded celeriac tossed in a tangy dressing made from mayonnaise, mustard, lemon juice, and seasonings, often served chilled as a side dish or starter. In German and Austrian cooking, Sellerie suppe highlights celeriac as the base for a creamy soup enriched with potatoes, onions, broth, and sometimes bacon for added savoriness, providing a comforting winter dish. Celeriac also appears boiled in mixed vegetable platters, such as those accompanying roasted meats in traditional Austrian meals, where it contributes its mild, earthy flavor alongside carrots, potatoes, and other roots. Italian regional dishes incorporate celeriac into zuppa di sedano rapa, a velvety soup blending peeled and cubed celeriac with stock, cream, and herbs for a subtle celery note. It is also used in risotto, where diced celeriac adds texture and depth to creamy rice dishes, or roasted slices topped with grated Parmesan for a caramelized, nutty finish. In Jewish and Eastern European traditions, celeriac features in some variations of tzimmes, a sweet stew combining peeled chunks with carrots, dried fruits like prunes and apricots, and honey for a festive holiday side. Grated celeriac salads, common in Polish and Ashkenazi Jewish repertoires, mix the raw root with apples, mayonnaise, and cream or yogurt for a crisp, tangy accompaniment to meals. Modern global adaptations emphasize celeriac's versatility in plant-based diets, such as vegan "steaks" where thick slices are seared and glazed with soy sauce and ginger for an umami-rich main course inspired by Asian flavors. Celeriac fries, oven-baked or air-fried for crispiness, serve as a low-carb alternative to potato versions in contemporary vegan menus. Culturally, celeriac remains a staple at Northern European winter markets, valued for its storage qualities and role in hearty seasonal fare, with its prominence in plant-based cooking surging in the 2010s amid growing interest in sustainable, meat-free options.

Nutrition and health

Nutritional composition

Celeriac, the variety of ( graveolens var. rapaceum), provides a nutrient-dense profile characteristic of . Per 100 grams of raw celeriac, it contains 42 kcal of , with 88 grams of comprising the majority of its composition. The macronutrient breakdown includes 9.2 grams of carbohydrates, of which 1.8 grams are and 1.6 grams are sugars; 1.5 grams of protein; and 0.3 grams of , making it a low-fat, low-calorie option suitable for various dietary needs.
NutrientAmount per 100g Raw% Daily Value*
Calories42 kcal2%
Water88 g-
Carbohydrates9.2 g3%
Dietary Fiber1.8 g6%
Sugars1.6 g-
Protein1.5 g3%
Fat0.3 g0%
*Based on a 2,000-calorie diet; values from USDA FoodData Central (2023 update). In terms of vitamins, raw celeriac is particularly rich in vitamin K at 41 μg (34% DV), supporting blood clotting and bone health, followed by vitamin C at 8 mg (9% DV) for immune function, and folate at 8 μg (2% DV) for cell division; it also provides trace amounts of vitamin B6 (0.165 mg) and vitamin E (0.36 mg). For minerals, it offers 300 mg of potassium (6% DV) for electrolyte balance, 115 mg of phosphorus (9% DV) for bone formation, 43 mg of calcium (3% DV) for bone health, 20 mg of magnesium (5% DV) for muscle function, while maintaining low sodium levels at 100 mg. Celeriac contains several bioactive compounds contributing to its antioxidant properties, including flavonoids such as apigenin and luteolin (and their glycosylated forms like graveobioside B), which exhibit anti-inflammatory potential. Additionally, polyacetylenes like falcarinol are present in the roots, known for cytotoxic activities against certain cancer cell lines. Its dietary fiber content supports gut health by promoting regularity and microbial diversity. Compared to celery stalks, which have higher water content (95 g per 100 g) and lower calorie density (16 kcal per 100 g), celeriac offers more concentrated nutrients due to its root structure.

Health benefits

Celeriac contributes to digestive health primarily through its soluble fiber content, which promotes bowel regularity and helps alleviate constipation by adding bulk to stool and facilitating smoother passage through the intestines. The vegetable supports bone health via its vitamin K content, which aids in bone mineralization by activating proteins that bind calcium to the bone matrix, thereby reducing the risk of osteoporosis and fractures. For cardiovascular benefits, celeriac's potassium helps lower blood pressure by promoting vasodilation and counteracting sodium's effects; meta-analyses of potassium intake indicate reductions in systolic blood pressure by up to 3-4 mm Hg among hypertensive individuals. Celeriac exhibits properties due to like , which inhibit the production of pro-inflammatory cytokines such as TNF-α, IL-6, and IL-1β in activated immune cells. Polyacetylenes present in celeriac and related vegetables demonstrate potential anti-cancer effects, with in vitro studies showing cytotoxicity against cancer cells by disrupting and inducing . Other benefits include improved hydration from its high water content, which constitutes over 88% of the raw vegetable and supports fluid balance in the body. Celeriac's low glycemic index of approximately 15 makes it suitable for diabetes management, as it causes minimal blood sugar spikes due to its fiber and low carbohydrate digestibility. Recent 2025 research emphasizes whole-plant upcycling of celeriac, utilizing aerial parts alongside the root to enhance antioxidant intake through bioactive compounds like phenolics, promoting greater anti-inflammatory and oxidative stress reduction. Despite these advantages, cautions apply for certain individuals. Celeriac contains oxalates at levels around 7 mg per 100 g, which may contribute to kidney stone formation in those prone to calcium oxalate stones by binding calcium in the urine. In rare cases, psoralens (furocoumarins) and related compounds can induce photosensitivity, leading to skin reactions upon sun exposure.

References

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