This is a famous war memorial poem written by Lieutenant Colonel John McCrae (November 30, 1872 – January 28, 1918),a Canadian poet, physician, author, artist and soldier during World War I and a surgeon during the Second Battle of Ypres.
The poppies mentioned in the poem are now a familiar emblem of remembrance day (Canada) and Armistice Day (USA) that is celebrated annually in ceremonies remembering the war dead at 11 am every November 11 signalling the signing of the armistice to end WWI at 11 on that day in 1918.
The red remembrance poppy has become a familiar emblem of Remembrance Day due to the poem "In Flanders Fields".
These poppies bloomed across some of the worst battlefields of Flanders in World War I, their brilliant red colour an appropriate symbol for the blood spilled in the war.
I enjoy reciting this sombre poem to myself every November 11 as my personal act of remembrance.