Yellow roses with red tips are called Circus roses. Bi-colored roses such as these may be naturally occurring, or grown as a hybrid between two rose species.
When roses are bred to express multiple colors and patterns, the plants are grafted, which means a cut from the more mature rootstock of the plant is made and a rose bud is joined to the opening. From here, the bud must be wrapped until the root is able to support the bud on its own. Although grafting is an easy method to achieve the growth of hybrid roses, the process must be monitored carefully as the grafted area can be damaged easily by cold temperatures. The ability to grow hybrid roses allows for ample possibilities of color fusions, making for beautiful additions to the home or a special event.