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hardy  Aroids)" <ARISAEMA-L at NIC.SURFNET.NL> Aroids)" <ARISAEMA-L at NIC.SURFNET.NL>
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From: Adam <irisman at AMERITECH.NET>
Subject: Re: A. triphyllum and environmental tolerances
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Re this topic.  I'm glad to see it, because I trhink the matter of cultur=e
needs more attention  tan its had.  Drainage is probably the most importa=nt
factor to be concerned with after minima have been met, i.e., light, some
water, air a few of the basic nutrientts,  butI would like to see
requirements for the individual species, keyed to climate.  Growing these
things is probably a bit like balancing a diabetic's diet.  One  can get
away with too much sugar for a while,occasionally,  if it's balanced out,
with something else, over time.  Nice to know the details about
stewardsonii's capability to tolerate moisture

Timing is probably a factor, also.  I know that  in irises, certain speci=es
can tolerate great amounts of water, if the drainage is immediate, thorou=gh
with lots of Ca available, but right after flowering, even an increase in
humidity may be  enough to  precipitate an adsurgence of a minor erwinia
infection, with consequent loss of the plant. . Re arisaema, what I would
like to know is:   Is there any data on whether a tuber, newly planted, w=ill
rot or grow roots?   Anything on how this is determined?  other than --si=ze
of tuber?  time since the last flowering, temperature? availability of
water?  mycorrhizae?  I hope some of this is in Gusman's new book, but I'=m
waiting on Amazon and have become impatient.


There are, I'm sure, also, differences among clones of individual species=,
not only in phenotype , but in other less obvious genotypic characters.  =At
this point, would it be premature to start a crude ranking of  tolerance =for
standing water (other factors being equal)    with sikokianum somewhere
towards the top of intolerant, and stewardsonii at the other end?
Adam FIkso, in Glenview, IL ,USDA ZOne 5a, with temperature today a nice
warm 31F, with sleet and two days ago , -7F




----- Original Message -----
From: "Jim McClements, Dover, DE z6" <JimMcClem at AOL.COM>
To: <ARISAEMA-L at NIC.SURFNET.NL>
Sent: Tuesday, January 28, 2003 8:52 AM
Subject: Re: A. triphyllum


> In a message dated 1/27/03 3:25:55 PM, tstuart at WESTNET.COM writes:
>
> << Yes. While the Tucker collection appears to be a different form, I'v=e
> seen my 30 cm natives double their size in a wet position, just as your=s
> did, David. As a corollary, they diminish after a dry spell. I have onl=y
> just started experimenting with other Arisaema species and moisture,
> inhibited by the mantra "drainage, drainage, drainage."
>
> It is hard to reconcile the incantation with what I see and with that
slimy
> gloop that makes up the decaying old tuber from late summer to the
> end of autumn. Does the drainage caution apply more to pots and to
> their wilder temperature fluctuations?
>  >>
>
> Tom
>
> I think that the drainage caution applies differently from one species =to
> another, and is particularly important for A. sikokianum and some other
Asian
> species. Many A. triphyllum grow naturally in wet areas, especially sub=sp.
> stewardardsonii.
>
> Winter wet seems to be the main problem, and, if anything, pot culture =is
> probably safer if watering is managed properly.
>
> Jim
>