Dahlias are straightforward to grow from seed. They will flower twelve weeks from sowing until first frosts. Superb as a cut flower and excellent for creating a statement in displays and herbaceous borders. They are particularly useful for filling in gaps that appear as other plants go to seed. Seed-raised Dahlias flower well especially towards the autumn. They are generally treated as annuals though they produce a tuber to survive the winter, which can be dug up, stored and replanted the following year.
Sow 2cm deep in spring. Expect germination in 10 days at 18 to 20 deg. C.