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I would bag them in brown paper and send them to the dump. I am also not sure that low mammalian toxicity makes this product a "green" thing. Read this and decide for yourself:
http://extension.psu.edu/greenindustry/giec/news/2011/some-observations-on-imprelis-injury-to-trees
Aminocyclopyrachlor is a synthetic auxin herbicide derived of a potassium salt.
Synthetic auxin herbicides are not metabolically stable in plants and are converted into several different products over time after application.
The killing action of growth-regulating chemicals is not caused by any single factor, but by the disruption of several growth processes in susceptible plants. They affect proteins in the plasma membrane, interfere with RNA production, and change the properties and integrity of the plasma membrane. Protein synthesis and RNA concentration increase as persistent auxin-like molecules prevent normal and necessary fluctuation in auxin levels required for proper plant growth.
I saw a paper from 2008 which indicated that 2 YAT (years after treatment)the effect of the synthetic chemical salt in the actual soil was less obvious, but that the effects on the soil of the chemicals which the potassium salt breaks down into was soil dependent. Clay and organic matter particles hold potassium ions in an available form, so potassium does not leach from silt-ey or clay-ey soil. Some leaching may take place in very sandy soils because sand does not contain enough clay to hold the potassium.
According to the EPA: Aware of the potential for aminocyclopyrachlor to cause similar problems, the Agency required labeling restrictions to reduce the risk of plant damage from aminocyclopyrachlor-contaminated compost.
These restrictions prohibit the use of grass clippings from treated areas in compost or mulch and require commercial applicators, such as lawn care company personnel, to notify residential consumers not to use treated grass clippings in mulch or compost.
Rutgers has a good website which has some information about the general effects of salts:
http://www.ifplantscouldtalk.rutgers.edu/PlantTalk/article.asp?ID=18
posted by 76.97.69...
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