There are four varieties
Siberia (bush variety, medium size fruit)
Russian Red (grows to 1.5m, small to medium size fruit)
Giant Tree Tomato (can grow up to 3m tall (??!!), huge fruit
Stupice (bush variety to 1.2m, smallish fruit)
I suppose it would make sense that tomatoes grown in colder regions would fruit in Australian winters. Apparently the tree tomato was fruiting in Sydney in August, although I am quite a bit south from there, so will have to see. Anyway, I am always up for an experiment, especially a plant based one and am excited to see how they go. I sowed 4-5 seeds of each variety, so fingers crossed, with successful germination, I should have enough to try planting outside and in the greenhouse. The seeds are available in the January issue of Burkes Backyard.
Click on the links to see the progress of the tomatoes: