----- Forwarded Message -----|
From: Wilbert Hetterscheid
To: 'Discussion of aroids'
Sent: Saturday, September 1, 2007 10:31 AM
Subject: Re: [Aroid-l] Determining Amorphophallus storage needs
Hi John and other peoples,
I cannot confirm your observation. In fact I have noticed quite the
opposite. In my collection, the ones that need continuous soil and/or
watering always have roots spread all over the tuber that usually are
healthy when the leaf has already died down. The ones that need dry
conditions and have lost their leaves, are usually also without roots or
have dead or dying roots.
My experience and that of others written to me, have changed my views on
dormancy issues in Amorphophallus quite dramatically over the years since my
publication with Ittenbach in Vol. 19 of Aroideana.
Generally it seems that species from (West-)Central Africa, West Malaysia,
Borneo, Java, Sumatra, S. & SE China and N. Vietnam need to be kept in soil
all the time. They tend to have rather short dormancies or nearly none at
all. They are from very wet areas (everwet tropical). During growth they can
hardly be "overloaded" with water during watergift. Species for which this
works good are:
excentricus (is also quite drought resistant)
glossophyllus (also quite drought resistant)
interruptus (also quite drought resistant)
koratensis (when young)
palawanensis (can also be stored dry)
scaber (only when young)
Unfortunately, this behaviour makes them the more difficult species to grow
(except the ones from N. Vietnam, S. & SE China and A. hottae). The ones
that have a prolongued dormancy are usually the stronger ones in cultivation
and need less humid conditions.
Then the smallest of species also appreciate not to be bone dry but they
must also be watered carefully and not become too wet. They too tend to have
hardly any appreciable dormancy and flower immediately after leaf shed or
alongside mature leaves:
I think Tony Avent and Alan galloway may have plans to pubblish on this. In
case the IAS board decides to reprint vol. 19, I will add a text on this
subject as introduction.
Of course it may be that under local circumstances at individual people's
places, plants may have a deviating behaviour. But this is merely a general
> -----Oorspronkelijk bericht-----
> Van: email@example.com
> [mailto:firstname.lastname@example.org] Namens John Ludwig
> Verzonden: vrijdag 31 augustus 2007 11:39
> Aan: Discussion of aroids
> Onderwerp: [Aroid-l] Determining Amorphophallus storage needs
> I have noticed one similarity in determining a tuber's need
> to be stored in soil or dry. I have noticed that the tubers
> that need storage in soil are predominantly the ones that
> grow their roots from the top of the tuber.
> Is this a correct observation and can I apply this rule of
> thumb to all Amorph's?
> Are there exceptions that I am currently unaware of?
> I have also noticed that all of the ones that I can store dry
> seem to have a smooth skin that seem to be shiny\waxy in appearance.
> I have also weighed my tubers to see if they have been losing
> weight due to dessication.
> When a new species is discovered, How are it's needs determined?
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