• The Greeks called walnuts karyon, meaning “head,” because the shell resembles a human skull and the walnut kernel itself looks like a brain!
• Due to its appearance, with the shell shaped like a human skull and the kernel resembling a brain, walnuts have always been regarded as “brain food.” Recent studies have proven that they do promote brain function because of their Omega-3 fatty acid content.
• The black walnut is the tallest variety of walnut tree and can grow to a height of more than 100 feet.
• Walnut trees can live up to 250 years.
• The walnut tree’s roots are strong and deep. It enhances its survival through a phenomenon called allelopathy, where the roots secrete chemicals called juglones that inhibit the growth of other plants near it.