Hardy Canna is a perennial aquatic plant, Herb. The height of the plant is 100-250cm (medium size of the plant, the height of the leaf surface of the plant is 60-150cm, but the height of the leaf surface is peduncle slender, often 50-100cm higher than the leaf surface); The leaves are basal, 4-6 pieces; The petioles are longer, about 40-80cm, the lower part is sheath-shaped, the base is slightly expanded, the tip and base of the petioles are reddish brown or yellowish brown; The leaf blade is ovoid-shaped to long oval, 20-50cm long, 10-20cm wide, hard paper, celandine Green, edge purple, entire margin; Leaf back surface is white powder, leaf abdominal mask sparse pilose. Leaf base is round and blunt, leaves are sharp and pointed; Transverse parallel veins.
Compound spikes, born at the top of the peduncle drawn from the leaf sheath; The total bracts are numerous, semi-closed, easy to fall off when flowering; Small flowers purplish red, 2-3 small flowers are covered by two small bracts, closely born in floral axis; most of them have only one small flower, which can have solid development results, while two or three of them have solid development results. Bracteoles 0.8-1.5cm, concave, leathery, abaxial surface hairless, surface mask wax coat, abdominal mask white pilose. Sepals 1.5-2.5mm, purple; Lateral staminodes are petal-shaped, Base White to lavender, Apex and margin dark purple, 1.2-1.5cm long, about 0.6cm wide; corolla tube short column, lavender, lip pocket-shaped, upper dark purple, lower lavender. Capsule nearly globose or obovoid spherical, long and wide axis is about 0.9-1.2 to 0.8-1.1cm, Peel is light green, and the tip is cracked when mature. Mature seeds are brown with rough surface, with Aril and obvious navel. 2n = 12.
Hardy Canna have massive rhizome, and the rhizome sprout and grows as a branch. Hardy Canna the root system is especially developed. There are dense adventitious roots on the rhizome, 70-90 roots on the rhizome 10cm long, 50-90cm long, lateral roots on the root, and lateral roots on the upper root are especially developed. Hardy Canna the space of underground roots and rhizome is huge, which is equivalent to the above-ground part.