Why Do Roses Have Thorns? Evolutionary Defense

The Purpose of Rose Thorns (Technically Prickles)

Botanically, roses have prickles (epidermal outgrowths), not true thorns (modified branches) or spines (modified leaves). But "thorns" is universally understood.

Evolutionary Function

Wild roses grew as brambles or sprawling shrubs. Prickles deter herbivores from eating stems, leaves, and flowers. Before human breeding for ornament, roses relied on this physical defense for survival.

Related Plants

Raspberries and blackberries (Rosaceae family) use similar structures.

Thorns = protection. Beautiful but armed.