Care of the shrub Poncirus trifoliata or Hardy orange |
|
The genus Poncirus, family Rutaceae, includes a single species of shrub native to Korea and China. Scientific synonyms: Citrus trifoliata, Bilacus trifoliata, Pseudaegle sepiaria, Aegle sepiaria. Common names: Trifoliate orange, Japanese bitter-orange, Hardy orange, Chinese bitter orange. They are shrubs or trees that reach 8 meters (26.24 ºF) in height. On the green and intertwined stems they have long spines up to 7 cm (2.75") in length. The glossy green leaves are scarce, leathery and are composed of 3 oval-shaped leaflets (the central one a little larger). The white, scented, 5-petal flowers sprout before the leaves. They bloom in early spring. The fruits, which give off a pleasant aroma, are like small oranges that are first green and then golden; they are not consumed since their taste is too sour. They are used as isolated specimens, in groups of 2-3 specimens, to form impenetrable hedges and as rootstocks for other citrus fruits. Poncirus trifoliata needs full sun or semi-shade exposure. They resist the cold well. They grow in any soil as long as it is well drained, even in poor soils. Planting will be done in spring or autumn. Water once a week in depth but do not flood; they do not withstand prolonged drought. Fertilize every 20 days in summer with mineral fertilizer. In autumn fertilize with manure. Prune intensively in winter if used as a hedge but will flower less. If they are grown as isolated specimens it's better not to prune them. They are plants very resistant to pests and diseases. They are propagated by cuttings in summer (under glass in a warm bed) or from seeds sown in spring. |
Images of the shrub Poncirus trifoliata or Hardy orange |
 Poncirus trifoliata  Poncirus trifoliata  Poncirus trifoliata  Poncirus trifoliata  Poncirus trifoliata  Poncirus trifoliata  Poncirus trifoliata |