Dahlias

in Plants
I love dahlias and have created a bed for dahlias in particular. It has been great since July but stopped flowering in late August. The plants are covered in buds but they simply are not opening. Does anyone know why this would happen?
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Also, not being funny but if you are deadheading, are you sure you're deadheading the right ones, the long pointy bits as opposed to the round ones ?
for the fag ends of the aristocracy.
S.Yorkshire/Derbyshire border