This section is from the book "Manual Of Gardening", by L. H. Bailey. Also available from Amazon: Manual of Gardening.
Turnips And Rutabagas are little grown in home gardens; and yet a finer quality of vegetable than most persons know could be secured if these plants were raised on one's own soil and brought fresh to the table. They are usually a fall crop, from seed sown in July and early August, although some kitchen-gardens have them from spring-sown seed. The culture is easy.
Turnips should be grown in drills, like beets, for the early crop. The young plants will stand light frosts. Choose a rainy day for planting, if practicable. Cover the seed very lightly. Thin the young plants to 5 to 7 inches in the row. Sow every two weeks if a constant supply is desired, as turnips rapidly become hard and woody in warm summer weather. For the fall and winter crop in the North, "On the fourteenth day of July, Sow your turnips, wet or dry".
In many parts of the northern and middle states tradition fixes the 25th of July as the proper time for sowing flat turnips for winter use. In the middle states, turnips are sometimes sown as late as the end of August. Prepare a piece of very mellow ground, and sow the seed thinly and evenly broadcast. In spite of the old rhyme, a gentle shower will then be acceptable. These turnips are pulled after frost, the tops removed, and the roots stored in cellars or pits.
For the early crop, Purple-top Strap-leaf, Early White Flat Dutch, and Early Purple-top Milan are the favorite varieties. Yellow-fleshed sorts like Golden Ball are very fine for early table use, when well grown, but most eaters prefer white turnips in spring, although they occasionally patronize the yellow varieties in the fall. Yellow Globe is the favorite yellow fall turnip, though some persons grow yellow rutabagas and call them turnips. For late crop of white turnips, the same varieties chosen for spring sowing are also desirable.
Rutabagas are distinguished from turnips by their smooth, bluish foliage, long root, and yellow flesh. They are richer than turnips; they require the same treatment, except that the season of growth is longer. Fall-sown or summer-sown bagas should have a month the start of flat turnips.
Except the maggot (see cabbage maggot, p. 201), there are no serious insects or diseases peculiar to turnips and bagas.
 
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