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  Amorphophallus growing season (was konjac ques.)
From: markdim at azstarnet.com (Mark A. Dimmitt) on 1997.09.06 at 18:59:14(1169)
I've been growing several species in my greenhouse at 32 degrees north
latitude (Tucson, Arizona) for several to many years. My A. konjac,
paeoniifolius, bulbifer, Syndandrospadix verm., and Pseudodracontium sp. are
all very seasonal. Though they sprout at very different times in spring,
they all go dormant in September or October. The Pseudodrac. may keep its
leaves all winter, but stops producing new ones.

My A. titanum and atroviridis are completely aseasonal. I've watched the two
clones of titanum most closely. They produce a leaf that lasts 12 to 15
months, then drop it for a few weeks to two months. This year they both lost
their leaves in mid August, and are already pushing new ones.

Now for my question: My larger titanum will probably hit my 10-foot roof
this time. Is there any way to shorten the petiole without harming the
growth of the tuber? Can't grow them outdoors here - all of my amorphos are
killed by a few weeks of 105+ (40 C) temps.

Mark

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From: plantnut at shadow.net (Dewey Fisk) on 1997.09.06 at 20:15:01(1171)
Mark
About all I can suggest is to dig a deep hole in the floor of you greenhouse....
Dewey

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From: "Carlo A. Balistrieri" <cabalist at facstaff.wisc.edu> on 1997.09.06 at 20:20:01(1172)
>Now for my question: My larger titanum will probably hit my 10-foot roof
>this time. Is there any way to shorten the petiole without harming the
>growth of the tuber? Can't grow them outdoors here - all of my amorphos are
>killed by a few weeks of 105+ (40 C) temps.

No question about it Mark, you're going to have to dig a big hole in the
greenhouse floor and lower the pot into it!

Carlo

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From: Rand Nicholson <writserv at nbnet.nb.ca> on 1997.09.07 at 08:28:48(1174)
>Now for my question: My larger titanum will probably hit my 10-foot roof
>this time. Is there any way to shorten the petiole without harming the
>growth of the tuber? Can't grow them outdoors here - all of my amorphos are
>killed by a few weeks of 105+ (40 C) temps.
>
>Mark

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From: "Julius Boos" <ju-bo at classic.msn.com> on 1997.09.07 at 08:32:55(1175)
----------
Sent: Saturday, September 06, 1997 11:20 PM
To: ju-bo@msn.com
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From: Craig Smith <craigsmith at sprintmail.com> on 1997.09.08 at 19:38:06(1190)
Mark,
I've been reading for several days about your pending problems with the
giant Arum. Perhaps it was my original question (or Don's posting) that
prompted you to send this note and start the flow it suggestions.
You might like to know that I can effect the height of my A. Konjacs by
almost a factor of 2 by the brightness of light. On the off chance that
your plant is in a darker area (in AZ???, right!!!!), I'd suggest that
you get it into more light and even add some light. My largest one is 6
feet across but only 4 feet tall because it is in the direct sun for 5
hours a day. When I had it on the porch, it was not as far across or as
thick a stem (by far) but it was taller. Also, they only grew tall (and
stocky) when I put them in a large pot (2 ft) and much richer soil. Of
course they didn't bloom either. But a friend (who I gave a tuber to)
had it in a smallish pot in the sun and didn't water as much. Much to my
surprise, he got a bloom this spring.

I expect to have a couple of tubers this fall which are about 1500-2000
grams. How big are the tubers you have been describing???

My problem, as you might remember, is a short growing season since the
oldest tuber only got up in August. I'm trying to extend the season by
using 6 florescent bulbs over the plant from 6 to 10 PM.

As you might also recall, I have been looking for a A. Titanum for a
couple of years with no luck. On the chance that you might have a
smaller tuber or offshoot that you could part with I thought I'd ask if
you might consider a trade. I know that you mentioned that you
already had A. Konjac (probably coming out your ears) but I heard that
they don't 'flower' in the south because of the hot weather. I'd be very
happy to trade one of mine which will almost certainly bloom. In fact,
I'd even be happy to recharge it the next year for you if you send it
back when it goes dormant.

As for a Titanum, there are 2-3 greenhouses here that would be VERY
pleased to babysit the Arum when it starts to frighten or attack my pets
and friends. The folks at the Rochester Civic Garden Center would be
especially interested as I have donated several dozen tubers for their
plant sale in the last few years and they seem very intrigued with the
photos I send along to help sell them and the article that was in the
paper when the last one bloomed.

In any case, this has been a realy interesting discussion.
Regards,
Craig

From: markdim at azstarnet.com (Mark A. Dimmitt) on 1997.09.09 at 06:03:49(1192)
Thanks to Craig Smith for his suggestion of increasing light to shorten
Amorphophallus petioles. Mine are in 2000 footcandles; I can probably move
them toward the front of the house where I have 4000-5000. It's also hotter
up front; hope heat doesn't stretch it!

I hadn't heard that A. konjac doesn't flower in the South. Mine flowered in
Tucson last winter; so did a friend's indoors. Greenhouse night temps ca.
55-60 F. I do have difficulty getting corms over 8" across with leaves 3'
tall and wide; I can't believe some of the sizes I've read about in this
forum recently.

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