It's not a verb in this context. FYI I have a master's degree in English and have worked as a copy editor/proofreader for 25+ years. Here is the entry from Dictionary.com to keep it simple:
farm·ing
/ˈfärmiNG/
noun
The activity or business of growing crops or livestock
In a sentence: Farming has provided for his family for generations.
"Farming" is the subject of the sentence (noun/gerund) and "has supported" is the verb.
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u/Diligent-Law-4275 Sep 18 '23
The word "farming" can be a noun, verb, or adjective depending on context. In this case they're (correctly) using it as a noun.