Is It Hard To Grow Watermelon Radish?

Is It Hard To Grow Watermelon Radish? For best quality, radishes need to grow fast and need to be harvested fast. Growing: Requires full sun and pH of 6.0-7.0. Extremely light feeders; no special soil preparation is required. How long do watermelon radishes take to grow? When ready to harvest, most radishes will bulge through