poisonous thorns

Are Bougainvillea Thorns Poisonous To Dogs? Well known for its showy blossoms, Bougainvillea has thorns that are toxic. Bougainvillea is a widely grown landscaping plant in warmer regions, due to its showy, cascading blooms. Its long arching branches are thorny, however, and care should be taken to not come in contact with them, as they