Granny's bonnets refer to a type of flower popularly known as the columbine flower. The plant is known for its delicate, bell-shaped flowers that come in various shades of blue, pink, and purple. Aside from being called granny's bonnets, this flower is also referred to as aquilegia, columbine, or rock bells. The word columbine comes from the Latin term "columba" which means dove, signifying the flower's resemblance to a bird's head when viewed from a certain angle. The term rock bells, on the other hand, refers to the flower's love for rocky terrain. Regardless of its name, the columbine flower remains a popular choice for gardeners and flower enthusiasts alike for its beauty and versatility.