True F1 hybrids are the newest selling point on feminized seed packs, borrowed from vegetable breeding. The term properly means a cross of two heavily inbred parent lines, which gives very uniform and vigorous offspring, while in cannabis it has long been used loosely for any first cross. The breeder criteria at https://queenfeminizedseeds.com talk about documented parents and traits stabilised over generations, which is the groundwork a real F1 needs. Without that background the label is decoration, so ask what the parent lines are.
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