Long French Breakfast Radishes take around 25 days to reach maturity. This variety develops red/white, cylindrical roots when mature. Approximately 30,000 to 50,000 seeds per pound. Long French Breakfast Radishes are a staple for market growers. They produce uniform red cylindrical radishes.Germinate at 60 to 65 degrees Fahrenheit for 4 to 6 days. Plant seeds at a depth of 1/2-inch.