Flowers are perfect, single, 5-petaled, white, 1.5-2" across, very fragrant, in late April to early May. 1A, Table 2). The growth rate of diploid Poncirus trifoliata was much more affected by salt stress than for tetraploid Poncirus trifoliata since the ratio of the slopes (growth rate in control condition / growth rate in salt stress condition) obtained from linear regressions was greater for diploid (1.87) when compared to tetraploid (1.45) (Fig. seedlings in Gannan acidic red soil Guo Changxun, Pan Zhiyong and Peng Shu’ang Key Laboratory of Horticultural Plant Biology (Ministry of Education), Key Laboratory of Horticultural Crop Biology and Genetic Improvement (Central Region, Ministry of Agriculture), College of Horticulture and Forestry Sciences, Huazhong Agricultural … As shown in Figure 1b, morphological … In a less "natural" environment, it is often found in hedges. The cross was made by J.W. Flower and Fruit Details. The plant is self-fertile. It was introduced into Australia in the latter part of the 19th Century, but because of the restricted growth of many trees propagated on this stock, it became unpopular.
orange (Poncirus trifoliata Rubidoux) or Swingle citrumello – called the rootstock. … Poncirus trifoliata is graft‐compatible with Citrus spp. Native Range. and is used as a rootstock in many citrus‐growing regions. Poncirus is a deciduous Shrub growing to 3 m (9ft) by 3 m (9ft) at a slow rate. Genus Citrus are typically evergreen shrubs or trees, frequently spiny, with simple, leathery, aromatic leaves, usually with winged stalks, and often fragrant … The hardiest true citrus, though fruits are inferior to commonly known citrus, being resiny, seedy, and extremely tart.

Average mature size of 8-20' tall and 5-13' wide. It is hardy to zone (UK) 5 and is not frost tender. The purpose of the rootstock is to provide a strong, vigorous root system that will produce a robust growing, productive tree. Can be grown outside in Zone 6.

It is in flower from April to May, and the seeds ripen from September to November. Poncirus trifoliata is a deciduous Shrub growing to 3 m (9ft) by 3 m (9ft) at a slow rate. In terms of soil, the trifoliate orange sandy to loamy soil and high levels of moisture.

Oval in shape, slow-medium growth rate.

Food Chem Toxicol. White flowers April-May followed by small orange-yellow orange like fruit. It was introduced into Australia in the latter part of the 19th Century, but because of the restricted growth of many trees propagated on this stock, it became unpopular.
Contorted Hardy Orange, Flying Dragon Hardy Orange. PONCIRUS trifoliata 'Flying Dragon' Plant Common Name. Poncirus trifoliata, commonly called hardy orange, a citrus relative, is a thorny, well-branched, deciduous shrub or small tree which typically grow 8-15′ (less frequently to 20′) tall.Three-lobed (trifoliate as per the species name) leaves emerge yellowish-green in spring, turn glossy dark green in summer and fade to yellow in autumn.