Diamant

Family: Apiaceae Root Vegetable

Sink your senses into Diamant’s richly aromatic, earthy-sweet celeriac—its flesh is creamy and fine-grained, with a crisp, dense bite that holds beautifully.

At maturity, this dependable market-class selection forms a well-rounded crown with smooth, attractive skin and a clean, uniform shape that’s a joy to handle and showcase. Grow Diamant for standout flavor in bold roasts, silky purées, and elegant gratins, or for crisp, refreshing preparations that highlight its distinctive celery depth.

Light: Part SunMaturity: 115 DaysHabit: Upright

Planting schedules and alerts are optimized for Columbus (Zone 6b).

Crop Dates

Milestone	Date
Start Indoors	Feb 28th
Last Frost	Apr 25th
Transplant / Sow Outdoors	Apr 18th
Harvest Begins	Aug 11th
Harvest Ends	Oct 16th

Crop Details

Trait	Value
Days to Maturity	115
Sun Requirements	Part Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	45
Min Night Temp (°F)	40
Harden Off (days)	7

Culinary Notes

Chef's Note

Diamant celeriac is built for heat: its creamy interior purées smooth without turning grainy, while the dense bite stays intact for roasting and gratin slicing. Pair it with buttery richness and sharp acid (mustard, lemon) to keep that earthy-sweet celery aroma bright, not muddy.

Best Uses

thick roasts or pan-sears where the dense interior holds structure
silky purées (especially when blended with butter/cream)
gratinues or baked cream-thick slices that benefit from a tight slice
raw or lightly dressed slaws for a celery-like crunch

Flavor Profile

earthy-sweet celery depth creamy, fine-grained flesh crisp-dense bite that stays firm bright, clean herbal finish

Kitchen Pairings

butter heavy cream mustard garlic fresh thyme lemon zest

Frequently Asked Questions

What pest or disease commonly affects celeriac (Apium graveolens var. rapaceum) and what should I do?

Celeriac often gets fungal leaf spots and early blight-like spotting (Alternaria/Cercospora) during warm, humid weather, which can start as small dark lesions on leaf stems and spread. Remove and discard infected leaves early, improve airflow by spacing plants, and avoid overhead watering so foliage stays dry; if the problem persists, apply a labeled copper fungicide according to the label. Slugs and aphids also show up frequently—use hand-picking at dusk or an iron-phosphate bait for slugs, and rinse aphids off with a strong water spray or treat with an insecticidal soap if needed.

How often should I water celeriac during its main growth phase?

During bulb (root) expansion, keep the soil consistently evenly moist—about 1–1.5 inches (2.5–4 cm) of water per week total, adjusted for heat and rainfall. Water deeply so moisture reaches the developing celeriac, then let the top 1 inch (2.5 cm) dry slightly before watering again to prevent splitting and rot. Mulch helps stabilize moisture, but ensure the crown doesn’t sit in soggy soil.

How can I tell when celeriac is ready to harvest?

Harvest when the celeriac “bulb” has reached full size and feels firm with a good, thick body—typically around 115 days from sowing, depending on conditions. The best cue is leaf condition and size: the outer stems should look strong but begin to thin as the roots mature; if growth is still rapid and the bulb feels light for its size, give it more time. Lift carefully with a fork to avoid bruising, then trim roots and leaves, keeping the crown intact for storage.