Juglans regia 'Zijing'

Juglans regia 'Zijing' (Chinese: 紫京彩叶核桃树,紫京核桃树) is a cultivar of walnut developed in Beijing, China,[1] expanded breeding upon the basis of the mother trees of Purple Leaved Walnut, which was founded in the depths of mountains, Qingshui, Mentougou District, Beijing in 1998.[2]

Juglans regia 'Zijing'
GenusJuglans
SpeciesJuglans regia
Cultivar'Zijing'

Juglans regia Zijing is cultivated by Wang Xiupo.[1][3] On 17 October 2017, Wang obtained the certificate of plant variety rights from the State Forestry Administration of China.[4] Because of the Juglans regia Zijing's trees have five major features of purple branches, purple female flowers, purple leaves, purple peel and purple walnut kernels, they are also called Wuzi Walnut (五紫核桃).[5] The trees of Juglans regia Zijing's are mainly distributed in Beijing International Walnut Manor currently.[1]

紫京核桃果
紫京彩叶核桃树雄花

Main values
  • Landscape agriculture
  • Military and furniture items
  • Road greening protection

Growing environment
紫京核桃果3

Growing at an altitude of about 800 meters above the hillside zones, Juglans regia Zijing's trees have strong resistance and adaptability as well as ornamental value, adapted to temperate climatatic regions.

Flowering takes place in May of Northern Hemisphere,fruiting in September.[1][6]

紫京彩叶核桃树嫁接
核桃树的嫁接技术

Planting methods

Gardens selection

Juglans regia Zijing's trees are resistant, adaptable, and have ornamental value. They can be planted and cultivated in Temperate climate regions. Owing to the fact that the Walnuts are light preferring plants, it is better to choose the south slope when building a garden in the mountains in the Northern Hemisphere.[1]

Planting management

The planting time of Juglans regia Zijing's trees is around the germination in late March of Northern Hemisphere. The survival rate of seedlings planted one to two years is higher. After planting, it should be irrigated with water, water and fertiliser management should be strengthened. Weeding should be performed frequently, and attention has to be paid to drainage Juglans regia Zijing during the rainy season. On the other hand, attention has to be paid to the prevention of pests and diseases from June to July of the Northern Hemisphere.[6]

Planting and cultivation

Scion collection

Select the developing branches and collect the annual branches without pests in the mid-March of the Northern Hemisphere for the scion.[1]

Grafting time

Grafting time is appropriate from the end of May to the beginning of July in the Northern Hemisphere.[6]

Bacterial root rot

Bacterial nuclear root rot, caused by Sclerotinia sclerotiorum, makes seedling root and its lateral root cortex decay, resulting in the death of Juglans regia Zijing's trees in part or in whole. The prevention and treatment methods are to select the nursery lands, dry up the soil, disinfect seeds and improve the soil.[6]

References
  1. "紫京彩叶核桃树大起底". Eastnet. Retrieved 10 March 2018 – via China Daily.
  2. "中华人民共和国国家林业局植物新品种保护办公室林业植物新品种保护公告" (PDF). cnpvp.gov.cn. Archived from the original (PDF) on 18 October 2016. Retrieved 10 March 2018.
  3. "紫色核桃树，绿化怎么用？". China Flower News. Retrieved 4 January 2022 – via Soha.
  4. "北京国际核桃庄园成功研发紫京彩叶核桃树-千龙网·中国首都网". China Internet Information Center. Retrieved 4 January 2022 – via qianlong.com.
  5. "紫京核桃十分稀有 年产量只有十几个". Beijing Television. 30 September 2017.
  6. "紫京彩叶核桃树 惊艳世界 特立独行". Phoenix Television. Archived from the original on 10 March 2018. Retrieved 10 March 2018.
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