* The field was a sea of purple, dotted with the prickly heads of thistles. (Describing the appearance of thistles)
* The farmer battled a stubborn infestation of thistles in his garden. (Using "thistles" as a noun for the plant)
* The old woman used to tell stories of thistles being used as a natural remedy for coughs. (Using "thistles" as a noun for the plant with a historical context)
* He felt a sharp pain as a thistle pricked his finger. (Using "thistle" as a noun referring to the plant's spiky nature)
* Her dress was embroidered with delicate thistles, a symbol of her Scottish heritage. (Using "thistles" as a noun with a symbolic meaning)
Remember that the context of the sentence will determine the best way to use "thistle."