This time of year, most people are eager for homegrown tomatoes. As tempting as it may be to get those tomato plants in the ground early with hopes of an earlier harvest, remember the requirements to promote healthy tomato growth.
Root Growth: Tomatoes require a soil temperature of at least 55 degrees F. The soil can be covered with plastic mulch to raise the temperature, but this may take several days. Measure the soil temperature at a depth of 2.5 inches at about 11:00 AM. Or take an average of the soil temperatures from a morning and an afternoon reading. Laying a line of drip irrigation beneath the plastic mulch will make watering more convenient and safer for the plants.
Air Temperature: Tomato plants do not tolerate frost well. Temperatures below 55 degrees F may prevent plants from setting flowers. Though the plants may grow and look healthy, blossoms may not produce fruit or the fruit that does result may be misshapen. Protect young plants by using hot caps or water teepees. This will provide a higher average temperature and promote growth.
Cynthia Domenghini, Extension Agent
