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 
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.

In a pot, I could bring it into the greenhouse whenever it would be 
recommended.  Unfortunately, it would be going from a sunny location to 
open shade since my greenhouse gets direct sunlight only when the oak 
leaves are down.  Also, it might not be able to get quite so much sunlight 
in a pot as it would in the soil.

So - what's best?

         Les
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