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Celery has, to us, a very nice flavor, but one of us at least regards the strings and the texture as a fatal flaw. Celeriac has the wanted flavor and a nice texture. One has to imagine that it's the pre-cutting look of this extraordinarily ugly little ball of roots (someone has called it "the vegetable octopus") that has kept it from its deserved prominence. It's not a great vegetable, but it's a quite good one.
As with too many good and useful vegetables, Celeriac seems only rarely to be discussed by cultivar, though if one hunts around one can eventually find quite a few types being marketed by seedsmen (but few carry more than one or two kinds each). Truth to tell, there seems little information--other than the claims in seedsmen's catalogues--on which to make a choice of cultivar (though many catalogues list only a generic type, there are surprisingly many named cultivars available to the diligent home gardener (one Polish seedsman offers five varieties none found, by us, elsewhere).
The Royal Horticultural Society (U.K.), in 2000, held a trial of 14 celeriac cultivars (details are linked farther below), including most of those available in the U.S., and--based on "smoothness; whiteness; uniformity; shape; size; taste"--gave their "Award of Garden Merit" designation to 4, those being, with comments:
All five plant types were 2 feet tall with glossy dark-green foliage. The roots (what we grow them for) of each were roughly the same size, and we wouldn't put a lot of stock in it as a criterion.
As a practical matter for U.S. gardeners, of those types listed above, only the Diamant and Monarch cultivars seem available on this side of the Atlantic; either should be satisfactory.
"Information" on celeriac culture shows hugely divergent and often quite contradictory kinds of advice. Apparently, it can be direct-seeded, but--especially in commercial practice--is started as indoor seedlings because the seed is tiny and hard to handle outdoors, the soil needs to be kept carefully and continually moist till emergence, the germination period is quite long (three to four weeks from sowing to full emergence), and the required growing period is very long--six to seven months. The home gardener is, we think, wise to this time follow commercial practice and start seedlings for transplanting.
Timing is crucial with celeriac, because it is by nature a biennial. If your transplants see more than perhaps a week or so of cool temperatures--anything below about 55°--they "think" winter has come; then, when it turns warmer with summer, they "think" they're already into their second year, and all their growth energy goes into the above-ground parts instead of the root, which is what we want. That means waiting to plant them out till (around here) at least April 1st, with mid-April probably safer. On the other hand, they like cooler weather for growing, so we don't start them as early as we can, lest they see the peak of summer while still mere transplants.
They spend a lot of time as seedlings, circa three months, and another four or so months outdoors. Celeriac can apparently take--and possibly even be immproved by--an early light frost or two, but it can't take hard freezes. If we want to harvest before the likelihood of killing frosts, early to middle October is the cutoff; thus, we sow February 15th for transplanting out around May 15th, when--we hope!--it's not too cool and not too hot, with harvest to follow in mid-September or so (though we can let them stay in till a killing frost seems imminent). but--heads up here!--you need to consider your own microclimate carefully and perhaps move those dates around by a week or two either way as circumstances and your climate records call for.
Celeriac seeds benefit from an overnight soaking (to hasten germination). After drying them on a folded paper towel, initial sowing should be in seed cells or the like, at about 1/8 inch deep; keep the cells warm--70° or 75°. Germination is quite slow--three or four weeks. When two true leaves have developed, carefully transplant the seedlings into seed trays, and grow them in coolish air temperatures. Transplant out about three months from initial sowing. (If young plants see over a week of air temperatures below about 55°, they are very likely to bolt.)
As we said above, it is very important (as with beets) to keep the soil about planted seeds continually moist till it germinates (and thereafter, for that matter). Be sure throughout to cultivate thoroughly but carefully, so as to keep the area weed-free without damaging the tiny plants.
Celeriac is a heavy feeder, and so grows best in soil that has been generously amended with plenty of compost or well composted manure. Soil with good drainage is wanted, preferably a sandy or clay loam. Some sources suggest a low pH, around 6.0, but the plants will probably do well anywhere in the usual 6.5 to 6.8 garden-soil range.
Jeavons recommends a deep-bed spacing of 6 inches for celery itself; for celeriac, it depends on at what stage you want to harvest. If you plan on harvesting early, as little as 4 inches may suffice; if you want to let them go on and on, you might need as much as 8 inches. Make your own call.
Celeriac loves wet soil. You cannot water it too much, and a thick layer of mulch will help tremendously in keeping the soil suitably moist. Inadequate or irregular watering can lead to hollow roots or bolting. Because celeriac does not compete well with weeds, cultivate around it conscientiously, but carefully (do not disturb its shallow roots). As the root develops, snip off side roots and hill the soil over the developing root.
Side dressing periodically during the growing season with an organic fertilizer high in nitrogen is also helpful, but don't overdo it, because that will encourage leaf, rather than root, growth.
Celeriac, like many "roots", is a long-season, cool-weather crop; it is slow-growing, taking typically seven months from seeding to full maturity (that is, about four months from transplanting), though the root is edible at any earlier stage. As a rule, the longer you leave celeriac in the garden, the larger the root gets; some say they seldom get woody when large, while others say harvest when small (circa 4-inch diameter) lest they become woody--ya pays yer money and ya takes yer chances. Likewise, some say celeriac is frost-tender, while others say a few light frosts won't bother it (some even say it helps its flavor). Probably most accurate is the statement "celeriac increases in flavor after the first frost, but it should be harvested before the first hard freeze." (Where winters aren't deadly, folk leave them in the ground over-winter, harvesting as needed till the next bunch of transplants is ready.) Also, some recommend drawing soil up around the stems in early autumn, to blanch them; others don't bother.
Besides any links presented above on this page, the following ought to be especially helpful:
Celeriac (like celery) is another from that wonderful family of useful root crops, the Umbellifrae, that also includes carrots, parsley (including rooted parsley), parsnip, fennel, dill, coriander, and some other less-common herbs. Umbellifrae are easily recognized by their characteristic lacy top growth.
The early history of celeriac is the history of celery. Native to the Mediterranean region, celery in its wild form is called smallagehttp://www.google.com/url?q=http://www.rhs.org.uk/Plants/Plant-trials-and-awards/Plant-awards/AGM-fruit-and-veg/AGM-asparagus_chard_pak_rhubarb_melon&sa=U&ei=-bMvT_zxMMqsiQKnsfjUCg&ved=0CAoQFjAD&client=internal-uds-cse&usg=AFQjCNGr9bYYtGljT0QCMwv0_UUOiVXNXg. Evidences of cultivated celery have been found in Egyptian graves from circa 1100 B.C. The Greeks called it selinon, and as such it is mentioned in Homer's Odyssey, dating from 850 BC. It is reported that the Greeks gave celery wine to winning athletes--celery "elixir" or "tonic" has long been thought to have pronounced medicinal benefits, and indeed, before the 16th century or so, celery was pretty much used exclusively as a medicinal plant.
It is only in 1543 that one finds a distinction being made between celery and celery root, or celeriac.
There remains to this day a small but steady and zealous following for that curious beverage, little known outside New York City, "Dr. Brown's Cel-Ray", which is basically just celery soda pop. It is, as a bearded gent used to say of a different soda product, "Curiously refreshing".
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