On 4/16/2016 4:15 PM, Je�us wrote:
> On Fri, 15 Apr 2016 17:54:09 -0400, Dave Smith
> > wrote:
>> Unfortunately, the previous owner had planted a row of black
>> walnuts near the garden. They were doing very well and after a few
>> years the garden failed and I discovered that black walnuts are toxic
>> too gardens.
>
> Are they? I wonder if they make the soil acidic or what.
>
Their roots produce a substance called juglone, which is toxic to many
(but not all) plants.