Grow Open-Pollinated Tomatoes - Plant Green Zebra Tomato Seeds. Chartreuse colored flesh with lime green stripes, Green Zebra Tomatoes are a garden favorite not only for their beautiful colors but for their sweet, rich tomato taste. The only problem you will have with this variety is when to tell if a green tomato is ripe! Hint: Green Zebra's light green stripes turn to yellow, and its firmness in your gentle hand will show a slight "give" much like when a red tomato is ready to pick.