Brilliant Tips for Planting Dahlias from tubers will tell you all you need to know about preparing the soil, placing the tubers, transplanting old tubers and spacing the tubers apart for optimum growth. Dahlia gardens can provide beautiful blooms for enjoyment for multiple months. One of the most versatile garden flowers, dahlias come in a wide variety of shapes and sizes. If you are looking for a good DIY flower garden idea, start a dahlia garden today!