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  hardiness of Amorphophallus konjac
From: Diana Reeck dianar at teleport.com> on 2000.08.05 at 14:55:57(5238)
Thanks to everyone who helped me with the hardiness of Sauromatum venosum -

Here's another one I have a question about - Amorphophallus konjac -

Any input is appreciated. Thanks.


From: Steve Marak samarak at arachne.uark.edu> on 2000.08.05 at 19:12:26(5239)
Pretty much the same story as with Sauromatum - quite hardy here in NW
Arkansas, nominally USDA zone 6. We've been warmer than normal the last 3
years or so (so much so that even Gloriosa survived outside last winter),
but I've been growing these for nearly 15 years now and they've survived
overnight lows of -25 C and several days of sub-freezing weather.

As with most aroids, they seem able to "move" by one mechanism or another
to whatever depth they prefer, and konjac seems to like it a bit deeper
than Sauromatum - maybe 10-15 cm for smaller tubers, a little more for

They are later to break dormancy for me, early June this year. Many people
have remarked on the tendancy of konjac to grow ever-larger tubers year by
year until some magic point is reached, and the large tuber becomes
several (I've seen up to 5 or so) smaller tubers, and mine do this
outdoors as well as in the greenhouse.

I grow it in full sun; it produces leaves up to a meter or so high with
petioles maybe 3-4 cm in diameter, but I've seen much larger specimens
other places. I don't know if that's just the size this clone reaches, or
if the relatively high light keeps it compact. I'd love to try some of the
dwarf/giant clones for comparison.


From: Dean Sliger deanslgr at juno.com> on 2000.08.05 at 19:13:08(5241)
Same as before: perfectly hardy here.

Dean Sliger

From: "Marge Talt" mtalt at clark.net> on 2000.08.06 at 11:02:56(5243)

It has survived outside in my garden for the last four winters -
admittedly relatively mild ones, but temps have stayed in the low
teens at night to highs in the low 20s (F) for a couple of weeks
during them. It is in a protected spot at the base of an east facing
bank and autumn leaves pile up there and are left where they fall.
It is very late to emerge - June, I think, just when I've given up on
it. Never has bloomed, but this year, three stems are up in place of
the normally single one. I am in cold zone 7 - USDA map says 6b, but
I don't agree, given some of the plants that winter over for me with
little effort.

From: Lester Kallus lkallus at earthlink.net> on 2000.08.06 at 11:03:49(5244)
I live on Long Island in what's supposed to be 7a but seems to be a tad colder.

I try to bring my konjacs in every year because by giving them an earlier start than they'd do outside, I get larger plants (or at least I tell myself that I do). Despite that, I always seem to miss a few tubers or offsets outside. For the past 3 years, I've found konjacs coming up all over the place in the yard; perhaps spread by the rototiller.

Anyway, they do seem to be reliably hardy here on LI.

From: Brian Brady citromatic at yahoo.com> on 2000.08.06 at 22:17:36(5248)
Those wacky konjacs. I'm about to try some
outdoors since I'm now knee deep in bulblets.
I'm in Seattle, and here in the city we get one
or two light frosts per winter and rarely below
30 degrees F.

My big konjac started out grapefruit size and put
up a stunning 3-foot petiole. The cat pulled
down the blinds and snapped off the trunk, and
now a week later I found a new shoot deep in the
pot! Also found zillions of bulblets here &
there too.

I'm wondering if I have a new "replacement"
petiole coming or a bloom... Any thoughts?

Brian Brady

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