Dahlias are stunning flowers that come in a wide variety of colors, shapes, and sizes. Their beauty lies in their large, showy blooms, which can range from a few inches to over a foot in diameter. The petals of a dahlia are usually thick and velvety, with a range of textures from smooth to ruffled. They come in a variety of shapes, including ball, pom-pom, cactus, and waterlily, each with its own unique beauty.