Celeriac Mars has a delicate taste, somewhere between celery and parsley. Rich in vitamins, try it raw shaved into a salad, mashed, slow roasted, in soup or French style in a remoulade sauce. Water frequently and regularly – celeriac demands a lot of moisture. Apply mulch around the roots in dry weather, to help keep the soil moist. Germination 14 – 21 days | Maturity 17 weeks