I'm gropwing 4 Karma dahlias this year - Corona, Naomi, Lagoon and Serena - but I am getting quite different results. Corona and Naomi are prolific with long stems - wonderful! Serena is really prolific but the stems are kind of short. Lagoon so far has produced few flowers and those have been on short stems.
They are all growing side by side so I didn't think it was cultural, but I have one Serena growing in a different spot and it seems to have longer stems.
Is anyone out there (like maybe Flowerfarmer?) growing these and have any recommendations or comments?