60 to 65 days to maturity. Raphanus sativus. Fall Storage Korean Radish Seeds. Cool season hybrid annual. This Korean radish variety is known for its longevity; it can be stored for as long as four months after harvest without losing any of its great flavor! Start it in the late summer or early fall. Besides its great shelf life, Fall Storage radishes have the same bright flavor and crisp texture you know and love from Korean radishes. Make sure you buy plenty of seeds to have radishes in storage for months! Approximately 4,000 seeds / oz.