Look closely along the soil line. See the roots growing near the base of the tomato plant?
This is why we plant tomatoes in a trench and lay them horizontally. Those additional roots that grow along the stem add to the vigor and get the tomato off to a good start.
Murray, a community gardener and tomato lover, deliberately planted this one horizontally at home in a tray before bringing it to the Pitney Meadows Community Gardens. See all the roots growing along the base of stem? They are white. This plant is off to a great start.