30-45 days. Non-GMO, Heirloom. Red Daikon Radish Seeds (Ostergruss Rosa). Raphanus sativus. A tapered red radish measuring from 5 to 8 inches long. Bright white to pale rose, crisp flesh. Best planted in spring or fall. Can be grown over winter where the ground does not freeze. This remarkably potent garden radish is intended to keep you feeling and living your healthiest! Fresh and crisp, Red Daikon radish gives a boost when juicing. A great choice for microgreens also.