60 days to maturity. Raphanus sativus. Alpine Gold Korean Radish Seeds. Hybrid, cool season annual, open pollinated. Alpine Gold radishes are a clean, crisp variety with smooth and polished roots. Compared to other radishes, Alpine Golds are sweeter, more disease tolerant, and slower to bolt! With soft green shoulders and creamy white flesh, these elegant radishes are sure to elevate any dish. Originally developed as a spring crop, they can also be sown in late summer or early fall.