Why is the poppy used to remember the English fallen soldiers?

The reason I think poppies are used is because of the color mainly, representing the blood shed people went through. There are plenty of them which shows that many people had sacrificed themselves for their patriotism and the urge come out victorious. The poppies are also used because they were the plants that surrounded the victims of war, which is a good use of tribute, which’ll make it easier to remember what they actually are signifying.