Thank you for the information. With hybrids, it is hit or miss, some are winners. I tried covering and almost burying them to protect them through the winter, but they all died. I regret not having taken a cutting of some tomato plants I had last year that were extraordinary producers. That's why I decided to plant them in pots this year, allowing the roots to grow into the ground, them pulling up the winners and keeping them inside for the winter.
I had a similar experience with my squash last year. They did poorly until the fall, when they suddenly began producing with the cooling of the temperatures. I am in California, 35 miles inland from San Francisco, where the summers are quite hot and dry. I tried building a cold frame around them last fall, but they perished in the winter. It seems that their productive lives could be extended if they had proper shelter.
There was a famous long-lived cherry tomato at Epcot Center: "The greenhouse’s biggest SINGLE tomato plant yielded a total of 32,000 tomatoes by the time it reached 16 months! They even won a Guinness World Record for the most tomatoes harvested from a single plant in a single year." http://thephotogardenbee.com/2010/01/03/disneys-epcot-greenhouses-are-amazing-part-i-the-land/
At Epcot Center: Tomato Plants hung vertically yield great numbers in their harvest © Britt Conley
I've also heard that peppers can grow as big as trees in warm climates.