I live in Wake County North Carolina, and have the most obnoxious patch of passion fruit you ever saw. In some areas of the planet it may control weeds-- I have no reason to doubt that in the tropics it may be allelopathic. And in other regions it certainly constitutes a beautiful exotic, when introduced for its showy flowers and carefully tended.
But around my place it just smothers everything. Such vines as I want to keep for ornament I have to train, so they don't strangle the other plantings. Fortunately I don't need a machete, as the stuff is shallow rooted and comes right up. But it has zero potential for controlling weeds. It can sprout amid a patch of healthy weeds and just head straight for the tree tops.
The fruit has a vaguely pleasant taste, although only a faint one (again, in tropical regions the flavor may well be stronger). And the flowers, as I said, are fabulous. But otherwise, this is one of the Lord's useless creations.
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