10+ Start these flowers from Dahlia seeds and grow these dwarf plants that are perfect for the front of borders or for filling pots and planters. Dahlia Opera also features double flowers, and this flower seed produces flowers in shades of deep purple mahogany. They love the heat and sun of summer, and they will bloom heavily right up until the first hard frost. Dahlia care includes deadheading spent blooms to keep a continuous supply of lovely flowers. Well-draining, rich and fertile soil that is slightly acidic is a must for growing Dahlias. Sow the flower seeds indoors 4 - 6 weeks before the last frost. Lightly cover the seeds with soil or peat moss only the thickness of the seed itself. Transplant seedlings outdoors after danger of frost has passed. Instructions included. Combined shipping discount....all additional items ship free.