

How to identify Hardy canna (Thalia dealbata)
Hardy canna, also known as Powdery thalia
Hardy canna displays a striking appearance with its spike of small purple flowers that rise prominently above the foliage during summer. It boasts elegant, heart-shaped leaves attached to lengthy petioles reaching up to about 6 feet (183 cm) tall, bearing resemblance to Strelitzia leaves. Its growth is characterized by a moderate spread through rhizomes. This plant thrives well in damp conditions and can tolerate being submerged to a depth of roughly 18 inches (45 cm). Its leaves and flowers are supported above the water in full sun to light shade environments.
Heart-shaped leaves with purple edges, up to 18 inches (45 cm) long, dusted with white powder.
Spike of small violet flowers on 8-inch (20 cm) panicles, blooming in pairs above foliage.
Dark reddish, unbranched stem with powdery texture, 0.5-1 inch (1.27-2.54 cm) in diameter.
Small utricles resembling achenes, rich purple-brown, holding dark brown-black seeds, 0.1-0.2 inches (2.5-5 mm).
Grows up to 6 feet (183 cm) tall, spread through rhizomes, thriving in damp conditions.
The thick, ovate to lanceolate blue-green leaves of hardy canna are dusted with white powder and edged in purple, reaching up to 18 inches (45 cm) in length. The upper surface is pale green and smooth, while the underside is greenish-white with hairs along the base, veins, and margins. During the day, leaves are displayed horizontally but stand more erect in the evening. Their bright green, lance-shaped form makes them distinctive.
The flowers of hardy canna are small, violet, and grow in dense clusters on panicles measuring about 8 inches (20 cm) long. They are carried high above the foliage, and the individual blooms appear in pairs. The purple petals are arranged symmetrically, enhancing their visual appeal. Typically, these flowers bloom during the warmer months, emitting a mild, pleasant scent. This distinctive floral structure makes them a noteworthy feature in aquatic or semi-aquatic garden settings.
The stem of hardy canna is distinguished by its dark reddish color and is covered with a fine powdery substance, giving it a matte and slightly rough texture. The stem is relatively thick, averaging around 0.5 to 1 inch (1.27 to 2.54 cm) in diameter, and generally unbranched. This sturdy and upright stem structure supports the plant's leaves and flowers, making it a notable feature for identification.
The fruit of hardy canna are small utricles, resembling achenes, with a near spherical to broadly ovoid shape. Mature fruits exhibit a rich purple to brown hue, providing a distinct contrast to the foliage. They envelope a single, dark brown to black seed, which typically measures 0.1 to 0.2 inches (2.5 to 5 mm) in diameter. The surface texture of these fruits tends to be smooth. These fruits' unique characteristics, including their coloring, shapely form, and internal seed, assist with identification.
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Scientific Classification of Hardy canna