White Icicle Radish Heirloom 3-6-inch Hardy Annual Known in the 19th century as White Naples, White Italian and White Transparent, this radish has a crisp texture that never becomes woody. Tapered white root tolerates a variety of soils and summer heat. Sow 1-2 seeds per inch in rows 6 inches apart in the spring as soon as the soil can be worked. Sow every two weeks for a continuous supply. Be sure to thin seedlings. During germination, keep entire seedbed evenly moist. Harvest anytime after roots reach eating size. Planting Depth: 1/2-inch Soil Temperature for Germination: 45-80-Degree F, day to Germination: 3-6 Plant Spacing: 4-inch, day to Maturity: 27-32 Full Sun Moderate Water