Answer: Tidal wave petunias are vining plants but if they are planted close together they will scramble up one another and form a tall hedgelike plant. I would plant a single tidal wave in the hanging basket and then pinch it back to train it to cascade over the sides. As each stem gets long it will get heavy enough to trail downward. Just pinch out the growing tips of each stem and your tidal wave should fill the hanging basket and spill out over the sides. It will look spectacular!
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