Culture: Winter radishes are slower-growing than the quick summer kind. Many grow deeper roots than summer radishes, often cylindrical in shape. Thin to 6" apart. They hold much longer than summer radishes but if they start to bolt, pinch off the tops. Ideal in September and October from an early July planting, and can be stored for winter.
⅛ oz packet sows 12½ ft; 1 oz sows 100 ft. Radishes average 2,500 seeds/oz.
Culture: Minimum germination temperature 40°, optimal range 55–85°, optimal temperature 85°. Emergence takes 11 days at 50°, only 4 days at 68°, 76% normal seedlings at 50°, 97% normal at 59°.
Disease: FY: Fusarium Yellows
Note: We cannot ship packets greater than ½ oz. (14 grams) of radishes into the Willamette Valley. The State of Oregon prohibits shipping any commercial quantity of untreated Brassica, Raphanus or Sinapis because of a quarantine to control Blackleg.