David Victor
Tue, 02 Sep 2014 10:48:52 PDT
I have to agree with Mark.  T. ciliatum can be dreadful planted out 
in the garden.  I planted a couple in my last garden and after less 
that ten years they had multiplied into hundreds and taken over an 
area about 20 years square.  We dug up bucket after bucket of 
golf-ball sized tubers, which had to be burnt, but still never 
cleared them.  That is all in the UK in a garden which regularly 
suffered cold winters and on heavy clay soil.  Never again!!!

best regards,

David Victor

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