Our local hosta society visited Mary Chastain, a well-known  hosta 
hybridizer in Ooltewah, Tennessee several years ago, and she told us she  
believed 
oak tree roots put out substances that inhibited hosta growth.   Since almost 
all woodlands around here contain oak trees, this might help to  explain 
the fact that the plants tend to decline in our gardens.  I doubt  that this 
was in any way a scientific observation, just a comment made from  her 
experience.  (My own experience would tend to make me agree with  her.)
 
(All hostas with "Lakeside" in their official names were  developed by 
Mary, of which there are many.)
 
Elin Johnson, Sweetwater, TN
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