Juglone

Tom Elias tselias@msn.com
Wed, 12 Sep 2018 11:07:47 PDT
Michael:
   Species of hickories in the genus Carya have very low amounts of juglone; while species walnuts in the genus Juglans have high amounts, especially in the husk surrounding the seed.  Juglone inhibits the grow of many plants attempting to grow underneath the canopy of walnuts.  Black walnut is a prime example.   My recommendation is not to try and grow amaryllids under walnut unless you want to experiment and determine how sensitive they are to the presence of juglone.

Tom (botanist)
________________________________
From: pbs <pbs-bounces@lists.pacificbulbsociety.net> on behalf of Michael Kent <kenttoto@gmail.com>
Sent: Wednesday, September 12, 2018 10:44 AM
To: post to list
Subject: [pbs] Juglone

Hello,

Anyone familiar with Juglone?

My collection of amaryllids and a few other bulbs spend the summer outside
under very high shade trees (mostly). A few squirrels in the neighborhood
generally spend their summer sitting up in said trees gnawing on nuts from
several of the hickory trees (mostly shagbark) on our property. A continual
cascade of chewed husk, broken shell, and discarded mostly whole nuts falls
down into the pots below. I generally pick out the bits at least every few
days on the off-chance that they're chewing up something other than hickory
nuts, or that enough hormones similar to juglone will leach out of the
shredded husk chunks to cause problems.

The squirrels are trying to fatten up for winter, so they've doubled down
on their feeding activities. I would now need to swing by every few hours
to keep up with cleaning out the bits, so I recently googled juglone. I
discovered that while hickory trees are in the Juglandaceae family, they
contain only trace amounts of juglone. Black Walnuts (which I knew about),
and Butternuts are the family members that contain high amounts of juglone.
As with any search on google, several of the sources contradicted each
other on which plants fall into the susceptible, or resistant category.
And, the only specific mention of amaryllids was Alliums and Narcissus
(both generally cited as resistant).

I have noticed that, in the past week or so, the squirrels have mostly been
discarding butternuts instead of hickory nuts. I'd like to be proactive ,
instead of reactive after one or more plants sicken or die. Does anyone
know any more concrete information concerning the susceptibility/resistance
of amaryllids to juglone?

Thanks in advance for any assistance rendered.

Mike - in the (Zone 6) Finger Lakes area, where we went, on Labor Day
weekend, from high temps/humidity to grey and rainy with overnight temps on
some days down into the 40s. I guess Labor Day really is the signal that
summer is over.
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