There's a reason I ♥ collarette dahlias & it's not just because they're stunning:
Above: Collarette Dahlia 'Giggles'
Although that cannot be contested.
The reason is simple. They're BELOVED by bees.
and anything they love, I love...
This time of year every bloom has at least one bee working it over.
Although "standing room only" is more the norm...
Don't be too quick to deadhead past-their-prime blooms either. As you see, they are still an important resource.
Reason to love right???
BTW: Collarette dahlias are so named because of the extra "collar" of petals around the disk. The collar is perfect because it's not too much to interfere with pollen & nectar collection but enough to provide an extra bit of frill. You know how I adore some frill!!! :)