70 days to maturity. Raphanus sativus. Karaine Hot Radish Seeds, Hybrid. Cool season annual, non-GMO. Hot radishes are a unique and flavorful variety of daikon that get their name from their sharp kick! Their lower moisture content makes their flavor stronger. Award -winning Karaine hot radishes are a great choice whether you are a beginner, or a daikon expert! Expect them to grow around six inches long and three inches in diameter. Approximately 2,500 seeds / oz.