Wave petunias are annual plants that are often used in hanging baskets and window boxes because they are fuller than regular petunias and have branches that overflow out of their containers. Wave petunias also make great ground covers. Wave petunias are available in many different varieties, each with colorful flowers that bloom from spring until summer.
Choose a location in full sun, if possible. Wave petunias will tolerate some shade, but need at least six hours of sunlight a day. In addition, avoid planting wave petunias in the same place as the year before since they don't do as well in soil where wave petunias were planted the year before. If you are planting in the same container as last year, then throw out the old soil and start will new all-purpose potting soil.
Dig a hole that is twice the size of the petunia wave's current container, but just as deep. Take the plant out of the container (keep the soil) and place it in the hole.
Space multiple plants about 12 to 36 inches apart. The closer together they are planted, the taller and fuller the plants will grow. On the other hand, the further apart they are planted, the wider and closer to the ground they will grow. In a container, plant one every 6 to 12 inches apart.
Backfill the soil and use your hands to firm the soil down to get rid of any air pockets. Water well and push down on the soil again.
Keep your wave petunias evenly moist throughout the growing season. Do not allow the soil to dry out