Walnut chips and juglone??

[wills-mill]

I seem to remember that Walnut has a chemical in it called juglone that kills off or supresses other plant life.

 

Does anyone know if it's throughout the tree or just the leaves? I chipped some up yesterday into householder's mulch pile, and only thought about it later...

[Paul Barton]

I thought it sent out juglone from the roots rather than in leaf litter. In which case you would probably be ok.

 

...ok, just looked it up online - apparently juglone is produced in leaves and bark as well but in much smaller concentrations. Fingers crossed for you!

[Andy Collins]

I would have thought that so long as the mulch is allowed to thoroughly compost, before applying to the beds etc, this shouldnt be too much of a problem, as it should leach away on the heap.