Mouka,
There are different kinds of 5b zones. In mine the biggest problem for peppers is the daily temperature swing. Even during July and August the night temps dip into the 50's and sometimes 40's. This makes the average pepper plant discouraged to say the least.
Many expert gardeners who live in other parts of the country don't have to think about this.
I always look at the source of the variety; if it comes from the south or from asia, it's not a good bet. Best sources are from Russia, North U.S., Canada, etc.
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