What flower means peace?

Online Answer
PoppiesPoppies traditionally symbolize peace and the end and remembrance of war, and this may have partially come from the fact that the flowers grew over the fallen bodies of soldiers who fought in the Great War in Northern France.
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They have been used since 1921 as a way of commemorating those members of the military who lost their lives in war. Poppies (or Papaver rhoeas) worn are seen as a mark of respect during the Remembrance month.