soil temperature for germination
The optimum temperature is 50 to 65 Â°F. Optimum soil temperature for seed germination is 45 to 85 Â°F. Radish seed will not germinate when the soil temperature is above 95 Â°F. Spring-planted radishes should be harvested early.The flavor of the radish bulb is also dependent on temperature.As a general rule, the cooler the temperature, the milder the radish.arrot. Planting: Carrots (Daucus carota) are cool-season plants that grow best at average temperatures between 60 and 65 Â°F. The optimum soil temperature for seed germination is 55 to 75 Â°F. Seeds will not germinate above 95 Â°F.