This section is from the book "A Dictionary Of Modern Gardening", by George William Johnson, David Landreth. Also available from Amazon: The Winter Harvest Handbook: Year Round Vegetable Production Using Deep Organic Techniques and Unheated Greenhouses.
Celeriac, Or Turnip-Rooted Celery {Apium rapaceum).
It may be sown in March, April, and May, to afford successive plantations in June, July, and August. The seed must be sown in drills six inches apart, and kept regularly watered every evening in dry weather, otherwise it will not germinate. The bed must be kept free from weeds, and when about three inches high, they may be pricked out into another border in rows three inches apart each way; giving water abundantly and frequently: by adopting the precautions mentioned in the cultivation of celery, the same seed bed will afford two or three distinct prickings. In the neighbourhood of Dresden, where this vegetable is grown in great perfection, they sow in February or March, in a hot-bed under glass, and the plants are removed in April, when two or three inches high to another hot-bed, and set an inch and a half apart. The fineness of the plants is there attributed to the abundance of water with which they are supplied.
When five or six inches high, they are fit for final planting; they must be set in rows two feet asunder, and the plants eight inches apart, on the level ground, or in drills drawn with the hoe at most three inches deep, as they do not require earthing up. In dry weather they should be watered plentifully, at least every other evening. The only additional attention they require, is to keep thein free from weeds. They require a very light fertile soil.
The directions given for saving the seed of Celery, are in every respect applicable to this vegetable.
 
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