Thorny plants are a type of plant that have sharp, pointed thorns. Two examples of these plants are briars and wait-a-bits. Briars are a type of shrub or small tree with thorns that can grow up to 10 feet tall. Wait-a-bits are a type of cactus native to the southwestern United States and northern Mexico. They have long, curved spines that can reach up to 6 inches in length. Both of these plants are known for their sharp thorns and can be difficult to navigate around.