How to Grow Celeriac Diamant

Celeriac Diamant

Apium graveolens var. rapaceum

vegetable

Celeriac Diamant is a cold-hardy celery root variety prized for its smooth, knobby underground bulbs with white flesh and mild celery flavor. It's a European heirloom variety known for its superior storage qualities and excellent disease resistance. This cultivar produces globe-shaped roots ideal for culinary use, from roasting to purees.

Growing Conditions

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Sun: Full sun to partial shade; 6-8 hours of sunlight daily for optimal bulb development

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Water: Consistent moisture is critical; water deeply 1-2 inches per week. Keep soil evenly moist but not waterlogged. Irregular watering causes cracked or woody roots.

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Spacing: 6 inches

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Days to maturity: 120-150 days

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Planting depth: Start seeds indoors 8-10 weeks before last frost at 1/8 inch depth. Transplant seedlings when 2-3 inches tall.

Soil

Type: Well-draining, fertile loamy soil with consistent moisture retention

pH: 6.0-7.0

Amendments:

Compost aged manure peat moss balanced organic fertilizer

Growing Zones

Find your zone →

Thrives in zones 3-9; excellent cold hardiness makes it ideal for northern gardens

2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a

Growth Stages

Seedling

4-6 weeks

Tiny plants with 2-4 true leaves emerge. Growth is initially slow.

Keep soil moist but not soggy. Provide bright light indoors. Thin seedlings if direct sowing, leaving strongest plants.

Vegetative Growth

6-8 weeks

Feathery foliage expands above ground; underground root development begins. Plants develop 6-12 leaves.

Maintain consistent moisture. Apply balanced fertilizer every 3-4 weeks. Mulch around plants to retain moisture and regulate soil temperature.

Bulb Initiation & Development

8-10 weeks

The underground corm swells noticeably; foliage continues expanding. The base of the plant thickens as the root bulb forms.

Continue regular watering. Remove any side shoots at the base to direct energy into the main bulb. Keep soil consistently moist.

Maturation

4-6 weeks

Bulbs reach 3-5 inches in diameter. The plant is fully developed with dense foliage; the root should feel firm and well-shaped.

Reduce fertilization. Maintain even moisture to prevent cracking. Monitor for pests and disease as the plant ages.

Harvest-Ready

Harvest as needed; stores 4-6 months in cool conditions

Bulbs are firm, smooth, and globe-shaped with minimal side roots. Foliage may yellow slightly as harvest approaches.

Can be left in ground in cold climates for storage, or harvested before hard freezes in zones 2-5. Excellent storage crop.

Companion Planting

Plan your garden →

Plant with:

Leek Onion Parsley Dill Chard Spinach Lettuce Beet Carrot

Avoid planting near:

Fennel Parsnip Potato Tomato Corn

Common Pests

Remove affected leaves; use reflective mulches; insecticidal soap if severe. Early removal of damaged foliage reduces pest populations.
Use floating row covers at planting. Destroy infested plants. Encourage beneficial insects with flowering plants nearby.
Spray with strong water jet; use neem oil or insecticidal soap. Attract beneficial insects like ladybugs and parasitic wasps.
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Handpick in early morning or evening. Use copper tape around plants or beer traps. Remove garden debris where pests hide.
Increase humidity with regular misting. Use neem oil or miticide. Avoid excessive nitrogen which encourages pest reproduction.

Uses

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Roasting & purées

Culinary

The creamy white flesh of Celeriac Diamant is excellent roasted whole or cubed, mashed into purées, or used in soups and stews. Its mild, slightly nutty celery flavor complements potatoes, cream, and garlic beautifully. [source]

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Raw salads

Culinary

Thinly sliced or grated raw celeriac adds crisp texture and subtle celery flavor to slaws and salads. The smooth Diamant variety peels easily and produces little waste. [source]

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Nutritional & digestive benefits

Medicinal

Celeriac is rich in vitamin C, potassium, and fiber. Traditionally used to support digestion and as a diuretic in European herbal medicine. Contains compounds studied for anti-inflammatory properties. [source]

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Excellent storage crop

Household

Celeriac Diamant's exceptional storage qualities make it ideal for root cellaring or cool storage. Stores longer than many other vegetables with minimal quality loss. [source]

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Stock & broth ingredient

Culinary

The bulb is a traditional ingredient in European vegetable stocks and broths, adding depth and mineral richness. Peels and trimmings make excellent broth bases. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Harvest when bulbs reach 3-5 inches in diameter, typically 120-150 days after transplanting. In cold zones (2-5), celeriac can be left in the ground and harvested as needed through winter due to its exceptional cold hardiness—use a blanket of mulch for easier digging. In warmer zones, harvest before temperatures exceed 80°F for extended periods, as heat causes deterioration. Cut foliage at soil level; the bulb stores best when undamaged. Diamant variety stores exceptionally well for 4-6 months in cool (32-40°F), humid conditions.

Fun Facts

🌱 Celeriac Diamant is a European heirloom variety originating from the Apium graveolens species, the same species that produces celery stalks. The 'rapaceum' variety evolved specifically for its edible root rather than leafy tops.
🌱 The 'Diamant' name refers to the exceptionally smooth, diamond-like appearance of the bulbs with minimal knobby side roots—a prized characteristic that makes peeling quicker and easier than rougher celeriac varieties.
🌱 Celeriac was known as 'celery root' to ancient Romans and remained popular in European cuisine through the Middle Ages. It has enjoyed a resurgence in popularity among home gardeners and chefs seeking heirloom vegetables with superior storage properties and cold hardiness.

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