you could always try from seeds. Many of us would be glad to share seed if needed. My favorite is Aristolochia Gigantea ! so beautiful !

I believe Aristolochia gigantea is toxic to pipevine swallowtail caterpillars. Goldrims/polydamas swallowtails do fine on them, but then I don't think they occur in California, just southern Florida.

I don't know where you can buy pipevines locally, but you can order both A. tomentosa and A. californica from Forest Farm.

Sherry

I have had success with the aristolochia gigantea but i have heard that some do not. if you are looking for butterflies, i would chose one of the other pipevine but nothing can beat gigantea for look !

We used to have an incredible show of pipe vine swallowtails in wild cat canyon(Richmond CA). : http://www.forestfarm.com/product.php?id=527. This is the California pipevine, unfortunately, it is about $30.00, or I would buy it. You are in SoCal: Las Pilitas does have the CA pipevine: http://www.laspilitas.com/nature-of-california/plants/aristolochia-californica

Here is a link that might be useful: las pilitas