I am eager to start planting some of my Sow & Grow seeds but I will wait for my soil to warm up a bit. Carrots, lettuce, and radishes like cooler weather but soil temperatures are best for germination as follows:
Carrots: The optimum soil temperature for seed germination is 55 to 75 °F.
For radishes, the warmer it is, the faster they mature. Radishes prefer cool and moist conditions for best growth. The optimum temperature is 50 to 65 °F. Optimum soil temperature for seed germination is 45 to 85 °F.
Lettuce seedlings should be protected from the wind because the young plants are rapidly dried out from the wind. The optimum soil temperature for seed germination is 60 to 80 °F.
Submitted by David Ellison 05/01/18