Dahlias can be grown from seeds or tubers. From seeds Dahlias can be sow between February and April under cover and then transplanted into deeper trays or individual pots when plants and large enough to handle.
From Tubers Dahlias can be started between March and April in pots under cover then transplanted in the garden between May and June.
Dahlias are originally from South America, they comes in varieties of colours and are wonderful as cut flowers