Vickie you say your petunias self sow-do they come true to color or all mixed up? I have never had luck with petunias. What does your cornflower look like?
I love larkspur but have not had luck with it either. I am afraid that I pull them up thinking they are weeds, that and I do use Preen some so they probably don't stand a chance. I have burmuda grass and I have not found a way to control it other than the big gun chemicals.
I hate that, that it is so invasive and chokes out everything here. It is impossible to pull and the roots are almost woody-very tough. I mainly just stick with perennials that I know are reliable. I have always avoided annuals because they are too slow to make a show and they need water like crazy. Plus they are pricey to replace every year.
Seedfork, I have always liked the pics of the lime green colored zinnia but have never tried planting them. Did have some cherry profusion one year that was HOT! loved it, and also liked the one that looks like a daisy, can't remember the name of it right off. But they bloomed like crazy and stayed neat looking, not tall and sprawling like some of the zinnias do.