Petunia colors

Petunia colors

Earlier this season I bought some nice deep red petunias for my yard. I planted the smaller ones in the ground and they are doing well, but the newer blooms don't seem to be as deep red... in fact, they look more like a faded red / kind of pinkish color. I'm assuming its due to a change in soil. Is there anything I can do to get them to start producing the deep red blooms again?
The good, the bad, and the tasty!

The good, the bad, and the tasty!

New room.

New room.

Garden update, 5/29/2008

Garden update, 5/29/2008

My front lawn

My front lawn

Moy Grande Hibiscus

Moy Grande Hibiscus

My room is very cluttered and messy

My room is very cluttered and messy