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Aristolochia thread

  • #21
Yep, that's them. There are hardy, tropical and subtropical species, found all over the world. The one you are thinking of is probably Aristolochia macrophylla (A. durior), a deciduous plant which is native to Eastern North America. I've never seen that one.

The ones I've grown are cold sensitive (zone 9b+) with the exception of A. fimbriata (zone 7, I think).

A friend grows a different hardy one (zone 5, I think) from Europe: Aristolochia baetica. He says it blooms all year for him, in California's Central Valley.

The Wikipedia article on Aristolochias is nice, with a surprising number of photos of different species. There are even tree forms, such as Aristolochia arborea:

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