Can you solve this riddle?

In 1209 on a hot summer day, there was a man who was ordered to be executed by the king. He was a nice king though and he said that if the man could prove himself wise he would let him go. The king filled a room with fake flowers and only put in one real flower in the room. The king said the man had 20 seconds to find the real flower. The man said "It's very stuffy in here. Could you open a window?" The king opened a window and the man immediately knew which was the real flower. How did he know?

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