Neal, the only daisy I have ever had luck with is 'Sante'. It is not plain but fuzzy to the point where it almost looks like a mum. It grows in my clay soil and gets quite big and blooms prolifically. I have tried Becky, Alaska, and Snowy Lady and none lasted more than two years. I'm not sure how long Sante would grow...I revised my garden where I had it and gave it away in the fourth year. Then I regretted getting rid of it and planted another one last year. Just a thought.
