In a manner that produces or bears fruit; productively or generatively in terms of fruit production.
From fructiferous plus the adverbial suffix -ly. This creates an adverb allowing writers to describe how actions or processes occur with fruit-bearing results.
Watching an orchard grow 'fructiferously' over decades means witnessing a kind of organic multiplication that economists and poets both find fascinating—it's literally compounding wealth in the form of food.
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