The Thistle – The Flower of Scotland. The story goes the English were planning to attack a Scottish camp at night. They started to advance on the sleeping Scots but one of the Englishmen crawled into a Thistle and gave out a yell thus alerting the Scots to the coming attack. The Scots managed to gather their wits about them and fend of the attack. From that moment onwards the Thistle has been the national flower.