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Heat treatment for foliar nematodes

I have a small clump of 'Eventide' that looked like it may have had foliar 
nematode symptoms late last fall.  At the Winter Scientific meeting it was 
reported that the hot water treatment for this appears to be very effective.  
At the AHS website it tells how to "cook" the plant, and says it is usually 
done in February, about a month before emergence. (That is more than a month 
before emergence in NW Indiana, where I live).  However, if I wanted to do 
this, I am assuming the plant must first be thawed out. How this would be 
done - remove all soil, or thaw soil and all slowly, wait until the ground 
thaws to dig the clump, or what? 
Bev Stegeman
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