WALNUT AND PECAN SHELLS/HULLS (HUSKS) & OAK BARK
are very high in tannic acids
and very toxic to plants. Keep in mind oak bark was used for years to soak with hides in a process called
tanning. Check areas where hulls are spread to dry. Not even a weed grows. They are now used for
surfacing farm roads and to sterilize soils. Very deadly.
EUCALYPTUS LEAVES:
Very little grows under a eucalyptus tree. I always thought it took all the
water. Wrong. The leaves are very toxic. They drip phenolic acid. They smother the ground when they
fall.
OTHERS:
There are other toxic organic plant materials. I do not have the research to support them.
They are not in use as much as is redwood, barks, cedar. How do you review what is toxic?
Please note
most toxic liquids leaving bark, redwood
,
cedar, and eucalyptus are very dark
- black, reddish
purple, very dark brown. The organic product may start as a light color, but will change with water to a
very dark color (black).