Lettuce is a cool-weather crop and can be planted in the spring once temperatures start hovering around 50 to 60 degrees Fahrenheit consistently, says Ryan ...

Remember, lettuce seeds germinate best in cool soil, so planting during the optimal times will yield the best results. How ...

Kent Bradford, left, and Alfred Huo, seen here with a flowering lettuce plant, found that lettuce could be prevented from flowering by increasing the expression of a specific microRNA in the plants.

Soil temperature, she says, affects germination of many garden foods. Domenghini said peas can sprout in soil that is 40 degrees Fahrenheit, while lettuce can germinate in 35 F. “Crops — such ...