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  Cold Tolerant Amporhs
From: Neil Carroll <ncarz at charter.net> on 2009.09.29 at 19:39:59(20093)

Doin a yard cleanup for a client today and found this Amorphophallus growing in a compost pile. This is in Mars Hill, NC and is in hardiness zone 6.
Thinking Amoph. paenefolius?? What do ya think?
Do folks know of other Amorphs that will live in these conditions?...the cold?


From: "Alan Galloway" <alan_galloway at bellsouth.net> on 2009.09.30 at 10:05:46(20097)

The plant in your photograph is a rather dark petioled form of Am. konjac.

I've found the following species of Amorphophallus to be cold hardy here
in USDA zone 7:



From: "Daniel Devor" <plantguy at zoominternet.net> on 2009.09.30 at 12:39:47(20098)
Hi Neil,

Looks like konjac and that species is hardy to at least Pittsburgh, PA (zone
6a I believe).

Nice looking grouping,


From: <ju-bo at msn.com> on 2009.09.30 at 13:27:18(20099)
Dear Neil,

Good to ''hear'' you on aroid-l!
Yup, A. konjac will grow where it is COLD!   Tom Croat grows this sp. in his garden beds OUTSIDE at his home in Mo., it was in seed when I visited him for the Missouri Bot. garden Aroid conference, a spectacular sight, leaves were still ''up'' too.
The petiole in the photo/jpeg LOOKS like A. konjac to me, but let`s wait for some other growers, more knowledgable than I, to respond.  This has NEVER been my genus/group!


> Date: Tue, 29 Sep 2009 12:39:59 -0700
> From: ncarz@charter.net



From: "Marek Argent" <abri1973 at wp.pl> on 2009.09.30 at 16:09:33(20102)

It looks rather like A. konjac with a dark petiole. I have never tried to
leave Amo's tubers in the ground,
but people say that konjac can survive in zone 6 (I also live in Z6).
I had no luck with Typhonium venosum reading that it can be hardy in Z6 I
left all my (about 20) tubers in the ground one year, but the following
winter was very cold with night temperatures -20*C/-2*F and I lost them all.


From: "Christopher Rogers" <crogers at ecoanalysts.com> on 2009.09.30 at 16:09:55(20103)
Looks like A. konjak.

D. Christopher Rogers



From: Steve Marak <samarak at gizmoworks.com> on 2009.09.30 at 19:27:34(20105)

I am also in zone 6 (NW Arkansas) though we used to periodically see -28 C
(-20 F) as overnight lows. The only Amorph that has proven itself through
the worst this climate has to give is A. konjac. I gave some to a friend
at the Denver BG and they have survived for 5 or 6 years there now also.

The only other species I have outdoors is a plant of A. bulbifer, which
has now survived for I think 3 years (I'd have to check the records) with
no special treatment. We have not seen anything below -18 C (0 F) for
about 9 years now, but it did come through the horrible ice storm in
January of this year with no problem. I know from experience with other
plants that some things that tolerate cold well will not tolerate a layer
of ice on the ground for days slowly melting, so that gives me hope for
long-term hardiness here.


From: "Marek Argent" <abri1973 at wp.pl> on 2009.09.30 at 20:32:48(20107)
Hello Steve,

How deep are the tubers in the ground?


From: Steve Marak <samarak at gizmoworks.com> on 2009.09.30 at 21:00:44(20110)

None of the konjacs are very deep. The largest maybe 6-8 cm, and smaller
ones are sometimes just below the surface, maybe 2-3 cm. I only disturb
them when I need to dig a few to give someone, so they have been mostly
left to themselves for more than 20 years in a couple of spots, and that
seems to be the level they like.

I don't know about the bulbifer - it's just the one, so I leave it alone.


From: "Daniel Devor" <plantguy at zoominternet.net> on 2009.09.30 at 23:53:48(20113)
Hi Marek,

I have had T. venosum survive here for many years in zone 6a. Last year we
were at -22C (-5F) several nights in a row and they all survived with
virtually no snow cover so I'm not sure why yours do not.

By the way, for those in a reasonable climate I was wondering how large
tubers of T. venosum can get. I pulled a couple out this fall that were
planted in amongst some other more tropical plants that needed to be dug and
the tubers were 6" in diameter (15 cm) and the larger one weighed 3 lbs 13
oz (~1.75 Kg) which is as large as I have ever had. I'm guessing in zone 8
or waremr they must get truly massive, but I was just curious as to how
large they can get?

Got to love those cold-hardy tuberous aroids besides Arisaema :o)


From: "Marek Argent" <abri1973 at wp.pl> on 2009.10.01 at 17:46:51(20123)
Hello Steve,

That's great. This year I have many young tubers of A. konjac, so I can try
to leave some.
I had once in my garden Zantedeschia aethiopica, it survived 3 years, but it
bloomed only once.
(scroll the page down).


From: "Marek Argent" <abri1973 at wp.pl> on 2009.10.01 at 18:14:17(20124)
Hi Dan,

Now I plant tubers of T. venosum in pots and during winter I store them in a
but earlier I planted them directly into the ground,
and it often happened that I didn't dig all of them in autumn,
then only the youngest tubers survived and put leaves next year,
but much later than these stored in the cellar.

My largest tuber was 11 cm in diameter and the inflorescence
grown from it was 86 cm (almost 1 fl) tall with the peduncle.
The cultivar 'Indian Giant' may produce larger tubers, I don't know cos I
don't have it.

Besides Arisaema I have in my garden 2 species of Arum,
2 species of Pinellia and Calla palustris (in water).
This year I bought Orontium, maybe it will survive too.


From: Steve Marak <samarak at gizmoworks.com> on 2009.10.01 at 20:22:48(20128)

I grow several Zantedeschia species and hybrids outdoors here (some of
them more than 15 years now) and they generally do well, but not Z.
aethiopica. In the greenhouse yes, outdoors no. It does as you say -
persists for a year or two, generally not growing very well, then dies.

I haven't tried jucunda or odorata outdoors yet - anyone know how hardy
they are?


From: Steve Marak <samarak at gizmoworks.com> on 2009.10.01 at 20:31:26(20129)
T. venosum also grows well outdoors here (NW Arkansas, zone 6) and has for
many years, at least the normal form. (I've got a couple of big seed heads
ripening at the moment, so something pollinates it, too.)

I have only one of the "giant" forms, and I haven't tried it outdoors yet.

Orontium is native over a huge part of the eastern and northeastern US
(and actually makes it into Arkansas, like Peltandra, though not in my
area). I've never grown it, but given where it occurs it must surely be
fairly hardy.


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