Group 1--Single-flowered Dahlias
Single flowered dahlias represent arguably the most simple and purest of form of this beautiful flower. A single type dahlia has a characteristic open centred disc which comprises of tiny florets in the middle of the flower. Petals will usually form one row around the centre, although there can occasionally be two rows and the petals can also overlap.
Single dahlias are usually quite small, with flowers commonly being about 4 inches or 10 cm across. There are also mignon varieties of single dahlia that have even smaller flower heads. These will usually be about 2 inches or 5 cm in width
Pictured - Northwest Cosmos