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Does Carpathian walnut release a lot of juglone?

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Location: Northern WI (zone 4)
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I got a deal on some Carpathian walnuts so now I have to find a place to plant them.  I have a butternut guild put together for juglone tolerant plants.  I'll have to put these Carpathian walnuts somewhere else.  Do they have alleopathic properties and if so, how strong are they?  I don't want to put them somewhere and end up killing a bunch of established stuff down the line.  I believe black walnuts are high on the juglone scale and I believe Butternuts are lower on the scale.  Any idea where Carpathians are on the scale?

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