and Glatt, that certainly is walnut there. Regarding the toxicity that a lot of people mention, I think they may be referring to Juglone.
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(from wikipedia: Juglone occurs naturally in the leaves, roots, husks, and bark of plants in the Juglandaceae family, particularly the black walnut (Juglans nigra), and is toxic or growth-stunting to many types of plants. It is sometimes used as a herbicide, as a dye for cloth and inks, and as a coloring agent for foods and cosmetics.)
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