I don't actually know what this (grain?) is called but it grows vividly in the fields of northern France.
I also stopped in the little village of Amettes where I visited the the birth place of a great French Saint.
St. Benoit (Benedict) Joseph Labre, who spent his life as a pilgrim, visiting most of the major shrines in Europe. Every year thousands of people make their way as pilgrims to his birthplace in Amettes.