So now you know about the reason for the day. But why are poppies a symbol of that day?
Remember that the land of Flanders had been smashed to smithereens? Well, over the next few years plants did start to grow again.
Poppies are plants whose seeds can blow in on the wind. And a poppy plant will put up with all kinds of poor soil. So, on those battlefields, the poppies began to flower, covering the lands each summer with a haze of shimmering red. That is why the poppy is used.