About Red Arrow Sprouting Radish: Though Red Arrow was developed specifically for its distinctive red sprouts, in its mature form it is a type of Japanese winter radish also known as a "daikon," which simply means "large root" in Japanese. Daikon radishes account for the largest percentage of any cultivated vegetable in Japan, and can be found in some form in nearly every meal of that country.
Red Arrow Sprouting Radish Germination: Since Red Arrow are winter radishes, they should be planted about two months before the first expected fall frost. Plant them in very rich, deeply worked up soil about 1/2" deep and 1" apart; later, thin the seedlings 4-6" apart. This variety can also be grown for sprouts.
Growing Red Arrow Sprouting 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 Red Arrow Sprouting Radish: These radish sprouts are ready to harvest after 3-5 days. The mature form of this radish can be harvested at any time, but will be most tender at a small size; they also store well for the winter.
Saving Red Arrow Sprouting 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 Red Arrow Sprouting Radish Info: Raphanus sativus. Biennial. 5 or 45 days. 2,500 seeds per oz. 6-12" height. 2-3" spacing. Produces red sprouts or oblong 4-5" dark pink radishes.