The soil should be loosened to a depth of at least 12-inches for annuals and 18-inches for perennials. Smooth the soil with a ground rake. Plant the flowers at the same soil level as they were in the container. Each year add more organic matter to the soil, or top a bed each year with a 2-inch layer of compost.
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Aug 27, 2018 · Fertilize monthly, keep the soil moist and provide full sun for the best blossoms. In zones 9 and above, wave petunias are perennial. For other ...