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  optimizing Amorphophallus growth
From: Lester Kallus lkallus at earthlink.net> on 2001.04.04 at 21:50:41(6146)
Will an amorphophallus grow appreciably better planted directly in the
ground than it does in a pot? I picked up a 4" paeoniifolius tuber while
visiting Selby last week and want it to grow the most possible over this
next growing season. What's best for it?

The trade offs are:
In the ground it will have unlimitted root growth. It's a high compost
soil mix that can be fertilized in any way the plant wants. The problem
though is that once late September comes around, evening temperatures will
begin to drop significantly. In mid October, nights will begin to dip in
the 40s.

From: "Wilbert Hetterscheid" hetter at worldonline.nl> on 2001.04.05 at 22:24:46(6153)

Go for the open ground! If you manage to give the plant a six-month growing
season as minimum, you'll probably get much better results than in a pot!


From: "S.P.J. Hoogma" s.p.j.hoogma at hccnet.nl> on 2001.04.06 at 02:55:50(6155)
Perhaps the best is to put the tubers in the ground in the greenhouse!

Sipke Hoogma

From: Steve Marak samarak at arachne.uark.edu> on 2001.04.06 at 03:56:52(6159)
> From: Lester Kallus
> Subject: optimizing Amorphophallus growth
> > Will an amorphophallus grow appreciably better planted directly in the
> > ground than it does in a pot? I picked up a 4" paeoniifolius tuber while

I'll summarize the tradeoff as essentially unlimited root room versus
mobility when external conditions are poor.

I face this issue too, since A. konjac is the only amorph known to be
hardy in our coldest winters. (I'd be most surprised - but very pleased -
to hear of others.)

I've run a couple of informal tests with konjac; with plenty of water in
both environments they get bigger faster in the ground. One of the
uncorrected-for flaws is that my outside konjacs have always been grown in
full sun, much higher light than where the pots go out for the summer.

However, I don't grow any other amorphs in the ground - all are in pots.
The other factor, which I haven't seen mentioned yet, that tipped the
balance is that these things mostly seem to have a mind of their own,
going dormant and breaking dormancy when they please.

Offsets of a particular plant, potted in separate pots, in different parts
of the greenhouse (i.e., different light levels, as much as 5 C
temperature difference), which receive different amounts of water when
dormant, will all break dormancy within a couple of days. I've even had an
offset I removed from a pot and left sitting on a table, with no soil or
water for weeks and not much light, start growth within 48 hours of its
clones back in the moist soil in the greenhouse. My internal clock should
be so good.

With the more tropical species, that time seems to have no relation to the
external season here, even after several years in the same spot. (Quite
the opposite for Synandrospadix, which puts leaves up about now every year
and goes dormant every fall regardless of how I treat it in the interim.)

Since I found I had to keep an eye on them and grow in pots any which
started growth during inclement times outdoors anyway, I just grow them
all that way.


From: Lester Kallus lkallus at earthlink.net> on 2001.04.06 at 15:28:18(6160)
That would be very difficult. My greenhouse is on the second floor of my
house and it has a tile floor.

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