Posted: 11/07/2014 at 09:23
Morning blighty mam
Have you put several dahlia seedlIngs in one pot?
I did same. Have kept half a dozen that do well every year.
Dahlias are only just starting to flower....they are mid summer to autumn so plenty of time. They suddenly are in flower from seemingly no sign of buds.
Check for slugs and snails too. I'm sure flowers will come very soon
(no tricks from seed. They will form tubers...I guess you know that already.....that produce bigger and bigger plants year on year )