Amazing colors and myriad forms elevate simple dahlia bulbs to something special in the landscape or garden. When choosing dahlia bulbs for sale in spring, consider how they will look in the landscape. Plant them in large areas for colorful and inviting displays that draw the eye over the entire property. Most types of dahlias can be overwintered in the ground in zones 8-10, otherwise the dahlia tubers should be lifted in fall and stored until the following spring. Growing dahlias in pots is another option for those in cooler climates.