About German Giant Radish: Radishes, in their early forms, come from the ancient civilizations of China, Greece, and Egypt; soon, surrounding nations also cultivated this vegetable. While the Oriental nations cultivated the large, elongated radishes, most of the round varieties such as German Giant were developed by the Dutch and the French. German Giant, as the name suggests, is an Amish heirloom that originated in Germany.
German Giant Radish Germination: Direct sow the first crop of radishes in rich soil, about four weeks before the last expected spring frost. Plant them in deeply worked up soil about 1/2" deep and 1" apart; later, thin the seedlings 2-3" apart or more for larger radishes. For a continuous harvest, plant a new crop every two weeks. Since most radishes do not tolerate heat well, it is best to avoid planting them in the heat of midsummer. For a fall crop and winter storage, plant about two months before the first expected fall frost.
Growing German Giant Radish Seeds: Radishes do well with consistently moist soil and the addition of organic matter such as compost. Do not allow the soil to dry out, but also avoid overwatering as this can cause splitting.
Harvesting German Giant Radish: German Giant radishes taste best when harvested at any size up to 4". They have fine quality and taste even at a large size, and have been known to reach the size of a baseball.
Saving German Giant Radish Seeds: Radishes will cross pollinate with all other varieties of radish, and must be isolated by at least half a mile from other varieties to protect genetic purity. Allow the radish plant to fully mature and send up a flowering stalk; the pods will form and turn from green to brown. Pick the brown pods and allow them to dry for several days. Thresh out the seeds by opening the pods by hand, or by applying pressure to crush them. Store the seeds in a cool, dry place for up to five years.
Detailed German Giant Radish Info: Raphanus sativus. Also known as Parat or Parat Sperling. Biennial. 29-35 days. 2,500 seeds per oz. 18-24" height. 2-3" spacing. Produces 3-4" red skinned, round radishes with white flesh.