A few of our tomato plants had fungus on the bottom of the stems. We had to pull them up so it wouldn't spread to the other plants. We still have a few heirlooms going strong in the garden.
These are not those tomatoes. These are cherry tomatoes that have gone rogue. They just took over a random spot in the yard near an old cherry tomato spot. We did nothing to encourage them. Sometimes (most times?) nature can do a better job then we can. This year we are going to try building low quick hoop houses over our tomatoes to keep them in the winter. I read about it Mother Earth News if you would like to try it too.