Dahlia Tubers

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Dahlia / Gladiolus / Lily Planting Guide Dahlia / Gladiolus / Lily Receiving Guide Dahlia plants are considered one of the most spectacular garden flowers. With minimum care, these beautiful flowers bloom the first year from mid-summer until frost, and add a lovely spot of flower color in the garden. Dahlia flowers are a tender perennial that are vigorous and fast growing. Dahlia bulbs must be lifted from the ground in zones 7 and lower. Dahlia varieties are an old-fashioned favorite, have superb, long lasting cut flowers, and are a welcome addition to the garden late in the season when other flowers are fading.