Specialty Gardening: What I'm I doing wrong?, 1 by pgt

pgt wrote:
I grew some Ramblin Nu Blue petunias from seed this year, and they are doing great in plastic pots and in my raised bed. But in my containers that have the brown fuzzy stuff (can't think of what it's called), the leaves are yellow with dark veins and the flowers are also looking lighter in spots. I don't have this problem with verbena planted in the same containers. And my Ramblin Red petunias in similar containers are doing fine. What am I doing wrong?