http://horticulture.oregonstate.edu/content/field-horsetail
This is listed in many places as being incredibly invasive and hard to control even though its a Native to many of these ranges! Many composting and topsoil and waste reuse companies will not accept anything which has even touched horsetail rhizomes. These are some of my geese favorite foods.
This, BTW, is why permies are more perfect than other web users.
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