Orange Dahlia

The Orange Dahlia, botanically designated under the genus *Dahlia* (particularly hybrids of *Dahlia pinnata*), is an exceptionally spectacular, highly vibrant tuberous perennial. Belonging to the family Asteraceae (the daisy or sunflower family, tribe Coreopsideae), this high-color classic is native to the mountainous, volcanic valleys of Mexico and Central America, where it was cultivated by the Aztecs before taking the horticultural world by storm in the 19th century.

Standing 1 to 5 feet (30 to 150 cm) tall depending on the cultivar, this bushy, herbaceous plant grows from a cluster of thick underground tubers. It features opposite, pinnately compound, and deep green leaves with serrated margins. From mid-summer through autumn (July until frost), sturdy hollow stems arise, topped by massive, intricate, and geometrically perfect flower heads (capitula) measuring 2 to 10 inches across.

These blossoms exhibit a stunning spectrum of warm, glowing shades of amber, copper, bright tangerine-orange, and sunset-bronze. The flower heads are composed of hundreds of sterile, flat or rolled outer ray florets (petals) arranged in complex, overlapping concentric circles surrounding a central disc of tubular yellow florets. The family-specific floral formula is EBr ⊕ ⚿ K0 C(5) A(5) G̅(2). This states that the flower heads are ebracteate, radially symmetrical, and bisexual (for disc florets). The calyx is reduced to K0, and the corolla has 5 fused petals. The 5 stamens have fused anthers, and the 2 fused carpels form an inferior ovary.

Cultivating Dahlias requires full direct sun (at least 6 to 8 hours daily) and rich, deep, organic-rich, and exceptionally well-draining soils with a neutral pH. They are heavy feeders and drinkers, requiring regular watering and balanced fertilizing throughout the growing season. Tall varieties require sturdy stakes to support the heavy flowers. They are hardy outdoors only in USDA zones 8 through 11; in colder northern climates, the tubers must be dug up in autumn and stored in a cool, dry, frost-free basement.

The genus name *Dahlia* honors the famous 18th-century Swedish botanist Anders Dahl. Famed as the national flower of Mexico, it was traditionally cultivated by the Aztecs for its edible tubers (which store water) and medicinal properties. Famed in Sanskrit as *Dahlia* (डाहलिया) and in Hindi as *Narangi Dahlia* (नारंगी डाहलिया), it represents inner strength, creativity, dignity, and eternal gratitude in the Victorian language of flowers.

For pet owners, the Orange Dahlia requires caution. All parts of the *Dahlia* plant are TOXIC to dogs, cats, and horses due to the presence of phototoxic polyacetylene compounds. Ingestion causes mild stomach irritation, drooling, vomiting, and diarrhea. Additionally, contact with the plant's sap can trigger mild skin irritation or contact dermatitis, which is worsened by exposure to sunlight. For complete safety guidelines, visit our general Pet Guard page. It is distinguished from zinnias by its large underground tubers. It looks stunning in autumn borders beside Salvia or Sunflower. To explore more Asteraceae composites, browse our Flower Identifier.