Soil Radishes require a well-pulverized seedbed. The elongated types require a soil free from clods, rocks, sticks, or other obstacles to even growth. Sandy loams, loamy sands, and silt loams types of soil are best. Radishes are intolerant of poorly drained soils. Soil pH levels should be at least 6.0.
Winter radishes come in several shapes and colors and can be stored just as carrots are stored.
Chinese Rose, Chinese White, Round Black Spanish, Long Black Spanish Planting Dates Radishes are frost tolerant and emerge most quickly when soil temperatures exceed 60 degrees. Plant winter types in early fall, since excessive cold makes them form seed stalks. Harvest the spring types before average daily temperatures exceed 75 degrees Fahrenheit. Daikon and winter radishes are sown at 2 to 6 inches in a row, depending on root size. These seeding rates require as much as 15 pounds per acre for the spring radishes, and as little as 3 pounds per acre for daikon or winter radishes.