The pontederia cordata is a rhizomatous perennial aquatic plant native to the American continent. It consists of a rosette of large, wide, thick and spongy lanceolate floating leaves, of a bright dark green color, which grow up to 50-60 cm in height. In summer it produces a decorative and showy ear of violet-blue flowers, whose central petals have a yellow spot on a long rigid stem; the flowering is usually long and can last until the first autumn colds arrive. P. cordata alba has completely white flowers. The plants of pontederia cordata they have vigorous growth and tend to form large colonies of fleshy rhizomes; with time it is good to check the size of the colonies, to avoid that they completely fill the water basin.
As for the correct indications for the exposure of this variety, it is good to know that the pontederia cordata prefers very bright places, preferably sunny; this species also adapts to partial shade, but not to full shade, where flowers usually find it hard to bloom.
Generally this variety of plants doesn't fear the cold weather, although much depends on the way it is grown, since the roots can freeze if exposed directly to the cold and harsh climate; in places where you are exposed to harsh winters it is recommended to keep the pontederie in deep water, so that the water around the roots and at the base of the leaves is not subject to frost.