|'Purple Top White Globe' is generally ready for harvest 55 days after sowing. The root is smooth, round, and, as the name suggests, purple at the top and white in the lower portion. Roots will grow to 5 inches in diameter, but are best when pickled at 2 to 3 inches. The turnip is a bienneal that is grown as an annual. This temperate climate crop grows best when temperatures are around 68 degrees F. Soil should be moist, but well drained and have a medium to low fertility level.
Turnips tend to bolt when soil becomes dry. Once ground is workable in spring, sow seeds and continue doing so about every 3 weeks until the first of summer or until weather gets too hot at about 3/4 inch deep. Space rows 9 inches apart and thin plants with scissors so they are about 4 inches apart. Early turnips can be harvested at about 5 weeks and main crop anywhere from 6 to 10 weeks. Much later than that and plants will be too tough.