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  Amorphophallus titanum dormancy
From: Riley2362 at aol.com on 2001.07.25 at 20:56:58(7128)
In July 2000, I obtained an A. titanum seedling from Selby, the seed of which
had been sown in 1999. It grew well all last summer on a NYC fire escape and
continued growing throughout the winter indoors. It had not changed
appearance much so I assumed it might continue growing throughout this summer
so I repotted it. I was surprised not to find many roots, but a nice firm
roundish tuber about 4" wide and 3" high. I went ahead and repotted it, but
now, about a month later the leaf is yellowed flopping over, as if it is
going dormant. I think all of this is quite normal and it is good that it
didn't go dormant for the first 2 full years and that's why it had no roots
left, so it should go completely dormant, lest it deplete it's nice tuber.
Correct? Now how to store the tuber; dry and deep in the pot, as I do my
other Amorphophallus species or bring it to the surface and keep an eye on it
with a little water once in a while? Cool storage or warm - any suggestions
would be appreciated. Do I sound like a nervous father?
Thanks - Michael Riley

From: magrysbo at shu.edu on 2001.07.27 at 21:35:26(7161)
You sound like me.
Can't go wrong dry. You can always lightly spray it to plump it up if
dessication begins, but its difficult to halt the progress of rot.
- Doing all my e-mail for the week,
Bonaventure Magrys

From: Steve at ExoticRainforest.com (ExoticRainforest) on 2007.10.21 at 02:35:36(16564)
There is one very recent post on a US garden site stating Amorphophallus titanum should not go dormant if kept above 50 degrees F (10 C). That is outside my understanding of the species though I do not grow this one. I asked at Fairchild Tropical Botanic Garden about their specimens at the IAS show and was told they were dormant. Obviously, it was well above 50 degrees F in mid September. Would one of you Amorphophallus experts please comment? I'd like to be able to copy your comments and post them on this garden site with credit to you.

Steve Lucas

From: botanist at malesiana.com (Peter Boyce) on 2007.10.21 at 04:22:54(16565)
This is nonesense; the area that titanum grows wild is subject to a marked monsoonal climate and during the dry phase the plants are dormant and leafless for an extended period; at this time the temperature is in the mid-high 30sC (mid-high 90s F). Furthermore, the temperature would never - even on a cold night in the height of the monsoon - ever drop below the low 20sC (c. 70 F).
----- Original Message -----
From: ExoticRainforest
From: Steve at ExoticRainforest.com (ExoticRainforest) on 2007.10.21 at 15:04:52(16568)
Thanks Pete! I've been getting some additional information in private mail.

Steve Lucas

From: bill.weaver at hp.com (Weaver, Bill) on 2007.10.23 at 01:57:33(16583)
My greenhouse is kept at a minimum of 65F and my Titanum has been going
dormant on a regular schedule for most of its 12 years.

Bill Weaver

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