I grow Amorpophallus Konjac... and from what I've read and experienced, it is the easiest species of the genus to grow.
I purchased the 'tuber' end of autumn and planted it into a free draining sand and mulch mix with a leaf litter mulch. Watered it on planting and not again until I noticed the first shoot which was in spring.
Currently the plant is still growing... I don't know when it will die off again for the winter hybernation though as this is my first season growing it...
I figure seeing as I live in Sydney and you near SF that our climates would be fairly similar. So maybe that's one species you can consider if it is available.