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Creating a high-impact container involves a dramatic vertical element (often called the "thriller"), a plant that will fill out the middle section (the "filler") and a plant that will tumble over the sides (the "spiller"). In this photo: canna, petunia (Supertunia) and a calibrachoa (Superbell).
Misty lilac wave petunias are my favorite. The color of this petunia reminds me of the species, while rewarding my efforts with vigorous growth and easy care. Double petunias are leggy-plant them with a frothy friend, like euyphoriba Diamond Frost. Some petunias need a buddy to shine.