28 days — The tender roots are best harvested while they are about three quarters of an inch in diameter and from four to six inches in length. 'White Icicle' roots are tapered in shape with thin, pure white skin and a rich, sweet flavor.
'White Icicle' originated from a German grower several years prior to its introduction into the United States in 1899 by J. M. Thorburn & Company. Thorburn stated:
"The name is given in allusion to the shape and the transparent whiteness of the root. The leaves are short, the flavor exceedingly fine, and it is about as early as the earliest forcing varieties. If well cultivated, it produces roots 3½ to 4 inches long in twenty-two days from date of sowing. This is the first long white forcing radish yet introduced."
Seeing the novelty of this radish, other seed companies began offering by as early as 1900. Each packet contains three grams, which is approximately 250 seeds.