Hello! I've recently purchased a few petunia (and petunia-like) flowers. I currently have petunias by the name of supertunia, black mamba petunia, madness red petunia, and pink sky petunia. I have no idea what the habits of these petunias are, or if they're grandiflora or multiflora, or even what either of those words are! I'm currently looking for the type of petunia that is more of a stick in spread, but with huge blooms about 16 inches high. What type should I be looking for? All help is appreciated!