At this time of the year, my dahlias look rather ragged. Yours look so healthy, Geof. I don't fertilize my dahlias because I am afraid that the fertilizer will make them too big and produce too many tubers. But I maybe wrong.
that using the compost and bulb fertilizer is the right way to go.
for your tips on growing them well and explanation of why some dahlias produce more blooms than others. Can't be helped! There are especially some dahlias too beautiful not to grow even just to get a few of their blooms.