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Dahlia. These showy blooms are available in a vast array of shapes and sizes and can add a vibrant or soft color palette to the garden from early summer till fall. Plant tubers in a sunny location; mix organic matter such as compost or aged manure into well-drained soil before planting. USDA Hardiness Zones: 8 to 10. In zones colder than Zone 8, dig in late summer or early fall and store indoors for the winter.