http://www.durgan.org/ShortURL/?VCPFM 24 August 2008 Green Zebra Tomatoes This is not a heirloom tomato, developed in 1983. It turns slightly yellow and soft when ripe. I have two plants, very healthy with many fruit. There is little to recommend this cultivar. http://www.durgan.org/ShortURL/?GPHKF 2008 Tomato Growing Experience.