The beautiful rose flower tops a green stem that has sharp outgrowths. Many people refer to these as thorns. If you’re a botanist, you might call these sharp outgrowths prickles, as they’re part of the outer layer of the plant’s stem. They don’t meet the strict definition of thorns, which have deeper roots in a plant’s stem. No matter what you call them, rose thorns are sharp enough to penetrate your skin and have the ability to pass infectious material into the wound.

Source: Healthline