When To Plant Dahlia Bulbs. Move them to a more open location in may or june. Plant dormant tubers outside in the spring if you don’t have a greenhouse or a warm, bright indoor location to germinate.
Dahlias will then blossom in late summer, usually in august and september. These are potted up and brought into growth indoors in late march or early april, then planted out in the garden in may once no more frost is forecast. After eight weeks, they will start to send shoots up through the soil.
Planting Dahlias Perfectly An Infographic! Easy To Grow Bulbs
Ad sign up to get free shipping. Dahlias can also be grown from rooted cuttings and from seed. Wait until all danger of frost has passed before planting out in the garden. Start dahlia tubers in march or april by potting them up under cover;
