The Dalia's I bought as corms turned out reasonably well but the ones I planted as seeds look tall and scraggy. Is it possible to grow decent Dalilah's from seed?
I think the pot is much too small and some of the leaves look pale: are there two plants? If not it may need more light. Did you pinch out the growing points to make it bush up when it was smaller?I believe the best thing would be to plant it out o r into a big container and remove the flowers, cutting it back to a better shape. It will soon flower again, more vigorously. Give it full sun and lots of water.
Seed raised dahlias will bulk up in time. Here are a couple of my Bishop's Children seed-raised dahlias. The red one is about 3 feet tall and the yellow about 5 feet (to the tallest flowers). They're about 5 or 6 years old.