Celeriac? I know that one well.

All plants Card

Celeriac

Apium graveolens var. rapaceum

Zones 3–9

Growing

Celeriac takes patience, as you are growing the swollen, bulb-like hypocotyl rather than the stalks. Sow seeds into a well-draining medium once the soil has warmed. Aim for a soil pH between 6.0 and 7.0. Because this is a cool-season crop, it grows in damp, even conditions, so keep your garden bed or container consistently moist to support the development of the heavy root.

As the plant matures, maintain consistent moisture to prevent the bulb from becoming woody. Unlike many other vegetables, celeriac does not continue to ripen once you pull it from the ground, so harvest it when the bulb has reached its full size. When you are ready to harvest, lift the root from the earth. To keep your harvest fresh longer, store the roots unwashed in a cool, dark cellar or in the refrigerator. If you plan to freeze your harvest, blanch the celeriac first to preserve its quality.

Stats
Sunfull sun
Watermedium
Grow time>150 days
Height1–3ft
Spacing12–24in
Light
Full sun✓
Part shade✓
Shade✗
Traits
Life cyclebiennial
Categoryroot
Growth habitrosette
Seasoncool
Frost tolerancehardy
Height1–3ft
Spacing12–24in
Days to maturityover 150
Growing
Watermedium
Drainagemoist
Soil ph min6.0
Soil ph max7.0
Propagation
Seed✓
Cutting✗
Division✗
Graft✗
Tuber bulb crown✗
Transplant✗
Container ok✓
Pollinationself fertile
Pollinator friendly✓
Toxic parts
Leaves✗
Seeds✗
Raw✗
Post harvest
Wash before storing✗
Ripens off plant✗
Curing daysnone
Shelf lifeover 3mo
Storage methods
Room temp✗
Cool dark✓
Fridge✓
Freeze✓
Can✓
Dry✓
Ferment pickle✓
Blanch before freezing✓
Calendar, zone 7
JanFebMarAprMayJunJulAugSepOctNovDec
Sownoyesyesyesnononononononono
Harvestnonononononoyesyesyesyesnono