Mars

Celeriac

Zone 10a Save Garden

🌱 110d to harvest Upright

Sink your spoon into the earthy, celery-bright character of Mars celeriac—its flesh is creamy and fine-grained, with a clean, aro…

Crop Dates

Milestone	Date
Start Indoors	Nov 7th
Last Frost	Jan 16th
Transplant / Sow Outdoors	Jan 9th
Harvest Begins	Apr 29th
Harvest Ends	Dec 19th

Crop Details

Trait	Value
Days to Maturity	110
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	70
Min Soil Temp (°F)	45
Min Night Temp (°F)	35
Harden Off (days)	7

Recommended Companions

Walla Walla White Onion

Parade Onion

Frequently Asked Questions

What pest or disease commonly affects celeriac (Apium graveolens var. rapaceum), and how can I prevent it?

Celeriac is prone to fungal leaf blights like Septoria and to celery leaf spot, especially in humid, crowded plantings. Start with disease-free seed/starts, space plants for airflow, and avoid wetting the leaves—water at the soil line. If you see spotted leaves, remove affected foliage early and consider a labeled fungicide for celery/celeriac before the problem spreads.

How often should I water celeriac during the main growing phase to get a firm, swollen root?

From when plants are actively growing until the bulbs begin bulking, keep soil consistently moist but not soggy—aim for about 1 to 1.5 inches (2.5–4 cm) of water per week depending on rainfall and heat. Let the top 1 inch of soil dry slightly between waterings, then water deeply to encourage steady thickening. Irregular watering can cause rough texture and hollow or splitting roots.

How do I know when celeriac is ready to harvest after about 110 days?

Harvest when the celeriac bulbs are firm and reach roughly 3–5 inches (8–13 cm) across, typically around 110 days from transplanting or sowing as your conditions allow. The bulb should feel dense, with leaf petioles still healthy rather than collapsing from severe frost damage. If you can dent the bulb easily with a fingernail or it feels hollow/light, it’s usually not ready yet—give it more time while temperatures stay cool.

Sink your spoon into the earthy, celery-bright character of Mars celeriac—its flesh is creamy and fine-grained, with a clean, aromatic snap that turns every bite into a fragrant delight. At maturity, this variety forms a handsome, knobbly-shouldered root with a smooth, pale interior that roasts beautifully for caramelized depth, and also shines when grated for crisp, refreshing flavor in salads and slaws. Mars is a dependable choice for home gardeners seeking a standout root vegetable with true celery essence and a luxuriously tender texture.

Sowing Tips

Transplant Conditions

Wait until soil reaches 45°F and nights stay above 35°F before moving outdoors. Harden off for 7 days first.

Expert Note

Grow celeriac with steady moisture and don’t let roots dry out—uniform watering helps form dense, storage-quality bulbs.