I'm on vacation and missed the original post. But, this is what I used when I
did Red, White and Blue 2 yrs. ago. Red Geraniums in the back of the planter,
Blue Petunias in the middle and White Bacopa in the front to trail down and
actually make a skirt around the pot.
Sue in Mi. (zone 5) but vacationing in Sunny, Warm Florida.