Mark Stumpf-Allen Edmonton December 17, 2010

I am looking for studies that disspell the myths that you should not compost things like citris, rhubarb, spruce needles, walnut, etc. Has anyone tested how long these organic compounds persist in a compost system (both active and passive), or a mulch environment.

Have you used walnut as a mulch, and did you find it had a negative impact on new or mature plantings; were there added weed suppression benefits from the juglone (could you use a thinner layer of mulch and get the same benefits)?

Thanks,

Mark Stumpf-Allen
Compost Programs Coordinator
City of Edmonton
Canada