Dinnerplate dahlias are the showiest of them all. If you're eager to have ginormous blooms that are, quite literally, as big as a dinner plate (up to 25cm across), then this category is the one to choose. With a wide selection of striking colours and varieties to choose from, you're sure to find varieties to suit your personal taste. Grow dinner plate dahlias in full sun, and plant them towards the back of borders or mass them for a totally awe-inspiring display. Dinner plate dahlias will need well-drained soil and plenty of sunshine. Stock up on canes to support them, since those gigantic flowers are so heavy.