[MissMoustache]

This information is from the book The Flower Farmer.

Grow pollen less varieties: Sunbright, Chianti (red, branching), Sunrich Lemon, Sunrich Orange, and Moonbright. Autumn Beauty and Velvet Queen are suggested for their unusual colors. Teddy bear, Sunbright, Sunrich Lemon, Sunrich Orange, Happy Faces, Taiyo, Golden Pheasant, Sunbeam, and Giant Sungold will last more than ten days in the vase. Sunbright does well as a dried flower.

The book suggests to transplant after last frost for first crop and then direct seed at the same time for a second flush of flowers.

I guess it depends which variety you grow and how long to flowering? I would grow different varieties and stagger the planting like farmers do for corn. So for example: start an early variety inside to transplant out and direct sow a mid season and late season variety for later flushes of flowers. Being in such a long season you could probably do a short season one again a month or two after you transplant and direct sow.