Wrote a longish post and then lost it. grrr! Here's the shortened version:
I had read...somewhere...that disturbing the roots of double zinnias when transplanting might make them revert to singles. Recommendations were to sow them in individual cells or peat pots--which is not part of the process of winter/spring sowing.
Googled the premise and saw it in several sites, including this one:
http://books.google.com/books?...
If the link doesn't work, it's from the Seed Starters Handbook.
But then, how much "disturbance" is too much?