Growing Fennel, also Bronze fennel

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21 Feb 21 colleen (USA - Zone 10b climate)
Thinking of growing fennel for the first time, to attract swallowtails. I've never grown it because I've heard it inhibits the growth of nearby plants. But I'm unclear HOW it does that. Is it a chemical exuded from the roots? In other words, would growing it in a large pot help? Or is it a compound the whole plant gives off, like a pheromone released into the air? One gardener told me they're only allelopathic if allowed to flower. Has this been anyone's experience?
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