Juglone

William R.P. Welch via pbs pbs@lists.pacificbulbsociety.net
Wed, 12 Sep 2018 21:37:06 PDT
All I know is once grew Narcissus in pots under a black walnut for years with no problems at all.  

BUT, a reliable source said they killed their narcissus where they put on a mulch of wood chips from a tree cutter that were made from black walnut 

Best wishes,

Bill the Bulb Baron (William R.P. Welch)

website: http://www.billthebulbbaron.com/availability.htm

William R.P. Welch, 1031 Cayuga Street, Apt B, Santa Cruz, CA 95062 (831) 236-8397

> On Sep 12, 2018, at 11:07 AM, Tom Elias <tselias@msn.com> wrote:
> 
> 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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