Highgarden is a spot in canon-terms that is considered as beautiful and rich, the surrounding territory belonging to Lord Mace Tyrell happening to be lush with food. Highgarden and it's surroundings of the entirety being the Reach are quite definitely what puts the Tyrells in competition for the richest family in Westeros. It is safe to say that the Reach has little worry come winter with their constantly growing food supply.
We're Getting Mutants in the MCU - The Loop
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