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  Advice on A. Titanum
From: TM8TERS4U at aol.com on 1999.02.25 at 16:09:56(3078)
I have a an Amorphophalus Titanum in a one gallon container. It is about 2.5'
tall. About half of the leaf is yellow brown and withering. It seems
otherwise ok and shows no sign of going down. Should I leave it alone, or cut
it down and let a new stalk grow back?

Thanks to the experts in advance.

Rick Cohen

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From: Don Burns <burns at mobot.mobot.org> on 1999.02.25 at 16:57:34(3079)
> I have a an Amorphophalus Titanum in a one gallon container. It is about 2.5'
> tall. About half of the leaf is yellow brown and withering. It seems
> otherwise ok and shows no sign of going down. Should I leave it alone, or cut
> it down and let a new stalk grow back?

Rick,

That one gallon container must be close to showing signs of pregnancy.
DON'T TAKE A KNIFE TO THAT PETIOLE! I'm certainly no expert, but here is
what I recommend:

1 - Your plant is showing signs of going dormant. In another week or three
the leaf will collapse. When it does, leave the petiole alone. Don't
try pulling it from the pot because it will still be attached to the
tuber.

2 - After another week or two the petiole will separate naturally.

3 - When you remove exhume whatever is underneath you will probably find a
tuber that is 5 or 6 inches in diameter. So obtain an oversize
container. My tubers that are this size are in 25 or 30 gallon
containers. From what I have seen so far, one of the secrets in
growing these things is to give the tubers as much room as possible.

3 - I wash tubers down in a solution of water and Physan. Then I'll
usually sprinkle a little Captan on it making sure that any soft, or
open sores get some of the Captan.

3 - Replant in fresh medium. I think this is especially important if the
tuber has any open sores. The medium should be slightly moist.

When you are going through the repotting process, don't leave the tuber
out of medium any longer than you have to. And certainly don't store it
in the open until it shows signs of growth. This is sure death for titanum.
No watering until you see the top of a petiole peek out from the medium.
This might take only four weeks, or it might take four months. I have
experienced both. Once you see growth begin, the watering and fertilization.
High phosphorous content preferred. I periodically give mine a heavy dose
of bone meal as a slow release source of phosphorous. In the repotting
process at Fairchild layers of cow manure (composted I think) are buried
in the containers. I have not done this.

This is a formula that seems to be working in the south Florida climate.
I'm sure you hear a bunch of variations on the above. There are several
success stories out there and I hope those will be shared with us.

Don

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From: Wilbert Hetterscheid <hetter at vkc.nl> on 1999.02.26 at 09:34:58(3081)
What you might want to do is check the base of the petiole by digging
into the pot to the top of the tuber. When only half or a part of a leaf
dies down, this may indicate a fouling part of the petiole base
resulting in lack of food for that part of the leaf that depends on that
fouling petiole base-part. If the base-part is indeed in bad condition
(slimey, brownish) then try to cut/scrape it away and check if the foul
originates from the tuber (in which case your problem is bigger than you
want). If so, also cut away the fouling part of the tuber. The extent of
the damage may lead you to decide to dig up the whole thing, cut off the
leaf entirely and clean the whole kaboodle. Use fungicides etc. to
desinfect cut/scraped surfaces.

If all this is not the case, then you can leave the plant as it is but
keep checking that the dying part does not itself lead to infections of
the petiole base.

Good luck! .

Wilbert

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