Celeriac (Apium graveolens var. rapaceum), also called turnip-rooted celery or knob celery, is from the same family as – you guessed it – celery. It is cultivated for its edible roots and shoots. It is sometimes called celery root too.
Celeriac is derived from wild celery, which has a small, edible root and has been used in Europe since ancient times. While what the early Greeks called selinon is mentioned in Homer’s Odyssey in 800 B.C., celeriac did not become an important vegetable until the Middle Ages. It was first recorded as a food plant in France in 1623, and was commonly cultivated in most of Europe by the end of the 17th century. Celeriac was originally grown in Northern Europe and the Mediterranean Basin. Today, the vegetable is still popularly grown. It hasn’t taken off in America as much but give it time, it took a while for the Brits to adjust to the ‘ugly duckling’ of the veggie world…
Today celeriac is uncommon outside of Europe or W. Asia, and is not widely used in Britain. It is popular in France (where it is used in the classic dish céleri rémoulade – matchsticks of celery in a flavoured mayonnaise) and Italy.
‘Prinz’ is recommended. I tried ‘Monarch’ last year and have sown the same this season.
Sow celeriac like celery: indoors in March, in modules in a warm place, keeping it moist before hardening off and planting out. Link to celery planting conditions: Celery
Plant them out 40cm apart. I plant my celery and celeriac in the same trench, just because they are both of the same family and both like the same conditions. For the permacultural enthusiast, try sowing leeks between them. They are a good companion plant that is meant to attract beneficial insects and deter the nasties.
Celeriac takes a lot longer to reach maturity in comparison to celery. Harvesting won’t begin until September or winter but they are frost hardy and can be left in the ground without protection until March. However, I urge you to earth them up and to not leave them too long – mine rotted in the wet winter weather we had this year and I didn’t get a chance to harvest many. After harvesting, store with the leaves removed to increase its life-span.
Typically, celeriac is harvested when its hypocotyl is 10–14 cm in diameter. However, a growing trend (specifically in Peruvian and South American cuisine) is to use the immature vegetable, valued for its intensity of flavour and tenderness overall. It is edible raw or cooked, and tastes similar to the stalks (the upper part of the stem) of common celery cultivars. Celeriac may be roasted, stewed, blanched, or mashed. Sliced celeriac occurs as an ingredient in soups, casseroles, stews and other savory dishes. The leaves and stems of the vegetable are quite flavoursome, and aesthetically delicate and vibrant, which has led to their use as a garnish. Never underestimate the wonders of celeriac or celery in stocks – along with carrot and onion they really make a wonderful tasting, hearty stock to use in risottos or soups (see: Egg Drop Soup with Vegetable Stock).
Celeriac contains no cholesterol or fat and provides an excellent source of dietary fiber.
Celeriac has the ability to absorb flavours without losing itself and works well with many partners. Mark Diacono recommends eating it with cream or layering it with potato to create a new dauphinoise recipe. Peel the celeriac, cutting off the knobbly parts and blanch in the water for a minute and then wash with cold water, if you are eating it raw. Cut it up in matchsticks and mix it with Greek yoghurt and slices of apple. Or carrot and beetroot for a colourful root vegetable salad. Try adding it to mashed potato, mashed potato and garlic, or mashed swede and carrot. It was delicious cut into tiny pieces and boiled/steamed alongside veggie/normal sausages, boiled potatoes and other boiled vegetables with cranberry sauce or redcurrant jelly and gravy. Alternatively, boil it, add some butter and finely chopped herbs, like parsley or dill for a side dish.