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The first plant was called Dahlia pinnata after its pinnate foliage; the second, Dahlia rosea for its rose-purple color. In 1796, from the parts sent by Cervantes, Cavanilles flowered a third plant, which he named Dahlia coccinea for its scarlet color. In 1798, Cavanilles sent D. pinnata seeds to Parma, Italy.
Dahlia pinnata is a perennial herbaceous plant with a rhizome and tuberous roots, reaching a height of 70 to 120 centimetres (28 to 47 inches), rarely 160 cm. The stem is erect, and branched only in the inflorescence. The leaves are usually simple, with leaflets that are ovate and 5–10 centimetres (2–4 in) long. The plant is slightly shaggy.
From its underground base, the plant will begin sending up hollow, cane-like, 4-sided stems with swollen nodes and large, tripinnate leaves; foliage near the ground is quickly shed. The pendant or nodding flowerheads are 7.5–15 centimetres (3–6 inches) across, with ray florets , typically a lavender or mauvish-pink in colour.
Dahlias will not come back in growing zones 6 and under, which is almost half of the US. “Those areas can have soil that freezes during the winter and that will turn the tubers to mush," says ...
Choose from our favorite dahlia types and varieties ahead and get ready for your garden to come to life! Ball Dahlia These dahlias have cute, rounded blooms that look like little pom-poms.
'Moonfire' (VanDusen Botanical Garden, Stan Shebs)The following is a list of dahlia cultivars which have gained the Royal Horticultural Society's Award of Garden Merit.They are tuberous perennials, originally from South America, with showy daisy-like composite flowerheads in all shades and combinations of white, yellow, orange, pink and red, flowering in late summer and autumn (fall).