North American Fruit Explorers mailing list at ibiblio

[Steven C <filtertitle@aol.com>]

Hi,

It's well-understood that black walnut exceeds, respectively, English 
(/Carpathian) walnut and hickory in its juglone toxicity to juglone-sensative 
plants (i.e. bluberry, pears, etc.).  However, "to a lesser extent" means 
very little to me.  

Will a juglone-sensitive plant be at all negatively impacted by the effects 
of being planted near an English walnut - or, being yet lower in juglone 
concentration, a hickory tree?  My suspicion is: to an extent, yes w/English 
walnut (J. regia), to much less an extent w/hickory (except maybe to a large 
extent w/pecan hickory).

Any anecdotal evidences here?

Thanks,
Steve