Amorphophallus konjac is hardy to zone 7

I have overwintered regular Colocasia esculenta (green EEs) and A. macrorhiza.

Time will tell because I have planted in my back yard (south facing, with lots of trees around it, so it is well protected), C. gigantea 'Thai Giant', C. esculenta 'Ruffles', A. plumbea 'nigra' (another Okie said she overwintered her nigra in a pot! outdoors), C. esculenta 'Black Magic', and C. esculenta 'Fontanesii'.

The only problem I would foresee in your neck of the woods (literally), would be the potential for rot in ground that is wet a lot. Seattle is know for its rain, so you would absolutely have to provide excellent drainage. These plants will rot easily.

Susan

Chris, Some of the finest Arisaema sellers in the country are in your neck of the woods.....remember, many of these plants come from areas with monsoon rains....rain is NOT the issue....temps might be, but not rain :o) Dan

Typhonium venosum and Typhonium giganteum have made it through the winter outside here in zone 5.
Susan

Dan, do you mean that cold, freezing torrential rains will not affect an EE in the ground? All summer I've been told that I shouldn't plant some EE's because they dislike cold, wet winter feet, and that throwing a bag of potting soil or mulch over the top of them, would kill them (they didn't, but just the same). I can understand torrential jungle, monsoon rains, but cold is different, wouldn't you think?

Susan

Hi Susan, Like I said, temps might be an issue, but not rain!!! Many of these plants come from areas with monsoons in the wet and dry the rest of the year....the plants I'm used to. I really only have a few EE just for the tropical effect. I do have both an illustris and a macrorhizus in bloom right now though....not much to look at, but sort of fun to dig through the foliage and look for the influorescence just the same!!

Susan, I'm glad to hear the Typh. giganteum can survive the ground.....I got some earlier this year and kept them in pots....they never broke dormancy.....I was ready to right it off as another useless aroid, but if it can go in the ground then I will just let nature do its thing :o) Dan

Hi Chris,
I just happened to think of my Xanthasoma violacea. I had two scraggly plants in the house that didn't get planted out until about 3 weeks ago. A little rain and afternoon shade and they are over my knees now. Some of the tubery things that were dry all winter (and I didn't think they could make it that way) are also coming up really well. My Alocasia macrorrhiza always does well, and Colocasia esculenta and Hmmm, a C. fontana? It's a Colocasia with really dark petiole that Alan Galloway was selling at the Raleigh ARoid fest- anyhow, those do well too. I always wish they would stay nice once I take them back indoors, but I guess I should be happy with how they look now!
susan