Reynoutria japonica, synonyms Fallopia japonica and Polygonum cuspidatum, is a large species of herbaceous perennial plant of the knotweed and buckwheat family Polygonaceae. It is commonly known as Asian knotweed or Japanese knotweed. It is native to East Asia in Japan, China and Korea. In North America and Europe, the species has successfully established itself in numerous habitats, and is classified as a pest and invasive species in several countries.
Skimmia japonica, the Japanese skimmia, is a species of flowering plant in the family Rutaceae, native to Japan, China, and Southeast Asia. Growing to 6 m (20 ft) tall and wide, it is a rounded evergreen shrub with glossy, leathery leaves widely cultivated as an ornamental plant in gardens and parks. Its fragrant flowers can be cream-yellow to white, followed on female plants by small, round, red fruits. The plant tolerates a wide range of conditions, including frost, drought, and atmospheric pollution. It is suitable for bonsai and for Chinese gardens.
Cleyera japonica (sakaki) is a flowering evergreen tree native to warm areas of Japan, Taiwan, China, Myanmar, Nepal, and northern India (Min and Bartholomew 2015). It can reach a height of 10 m. The leaves are 6–10 cm long, smooth, oval, leathery, shiny and dark green above, yellowish-green below, with deep furrows for the leaf stem. The bark is dark reddish brown and smooth. The small, scented, cream-white flowers open in early summer, and are followed later by berries which start red and turn black when ripe. Sakaki is one of the common trees in the second layer of the evergreen oak forests. It is considered sacred to Japanese Shintō faith, and is one of the classical offerings at Shintō shrines.
Kerria japonica, also known as the Japanese marigold bush or miracle marigold bush in the northern New England area and as yamabuki (山吹) in Japan, is a deciduous shrub in the rose family Rosaceae, native to China, Japan and Korea. It is named after William Kerr, who introduced the cultivar 'Pleniflora'. It is the sole species in the genus Kerria; its genus name is also used as a common name (kerria).
Chaenomeles japonica, known as either the Japanese quince or Maule's quince, is a species of flowering quince. It is a thorny deciduous shrub that is commonly cultivated. It is shorter than another commonly cultivated species C. speciosa , growing to only about 1 m in height. The fruit is called Kusa-boke (草木瓜, Kusa-boke) in Japanese. It is best known for its colorful spring flowers of red, white, pink or multi. It produces apple-shaped fruit that are a golden-yellow color containing red-brown seeds. The fruit is edible, but hard and astringent-tasting, unless bletted. The fruit is occasionally used in jam, jelly and pie making as a substitute for its cousin, the true quince, Cydonia oblonga . C. japonica is also popularly grown in bonsai.