Japanese pond lily

Japanese pond lily (Nuphar japonica, Nymphaeaceae) is a perennial of shallow ponds, marshes, rivers and ditches from south-western Hokkaido through Honshu, Shikoku and Kyushu, and is sometimes regarded as endemic to Japan. Its Japanese name, 'river bone', comes from the thick white rhizome creeping through the mud. It has submerged leaves and aerial leaves: the aerial leaves are oblong with arrow-shaped bases, 20–50 cm long, leathery and glossy dark green, standing above shallow water or floating in deeper water. Submerged leaves are thin and wavy, and in flowing water only these may form. In winter the aerial leaves die back, leaving the submerged ones. From June to October single yellow cup-shaped flowers 3–5 cm across open upward on long stalks; the petal-like parts are five sepals. Forms with reddish flowers and variegated forms are cultivated. River works and farmland consolidation have made it scarce, and it is red-listed in many prefectures, so buy cultivated plants rather than collecting from the wild. The related Nuphar submersa is a separate species whose collection and transfer are generally banned under the Species Conservation Act, so do not confuse them. It suits biotopes and ponds, and its submerged leaves can be enjoyed in aquaria. It is sold by garden centres that handle aquatic plants in Japan.

Source: Wikipedia (CC BY-SA 4.0)

The Japanese pond lily grows to Aerial leaves 20–50 cm long; flowers 3–5 cm across.

The ideal temperature for the Japanese pond lily is 20〜28℃.

Grow in rich mud or paddy soil