Lonicera japonica, known as golden-and-silver honeysuckle or Japanese honeysuckle in English, suikazura(スイカズラ／吸い葛 or 忍冬) in Japanese, jinyinhua(金银花) or rendongteng(忍冬藤) in Chinese, indongdeonggul(인동덩굴) in Korean, and kim ngân hoa in Vietnamese, is a species of honeysuckle native to eastern Asia including China, Japan and Korea. It is a twining vine able to climb up to 10 metres (33 ft) high or more in trees, with opposite, simple oval leaves 3–8 centimetres (1.2–3.1 in) long and 2–3 centimetres (0.79–1.18 in) broad. The flowers are double-tongued, opening white and fading to yellow, and sweetly vanilla scented. The fruit is a black spherical berry 3–4 millimetres (0.12–0.16 in) diameter containing a few seeds.
It is an invasive species in a number of countries.
Cultivation, management and uses
This species is often sold by American nurseries as the cultivar 'Hall's Prolific' (Lonicera japonica var. halliana). It is an effective groundcover, and has pleasant, strong-smelling flowers. It can be cultivated by seed, cuttings, or layering. In addition, it will spread itself via shoots if given enough space to grow.
In both its native and introduced range, Japanese honeysuckle can be a significant source of food for deer, rabbits, hummingbirds and other wildlife.
Japanese honeysuckle has become naturalized in Argentina, Australia, Brazil, Mexico, New Zealand and much of the US, including Hawaii, as well as a number of Pacific and Caribbean islands.
As an invasive species
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Japanese honeysuckle is classified as a noxious weed in Texas, Illinois, and Virginia, and is banned in New Hampshire. It grows extremely rapidly in parts of America such as southwestern Ohio and is virtually impossible to control in naturalized woodland edge zones due to its rapid spread via tiny fruit seeds. It aggressively grows over native shrubs and trees, choking them, and can also form mat-like monocultures that prevent the establishment of native species. The succession cycle of a forest is not all that different than a human life span-70-100 years. Accordingly, it is the aggressive displacement that poses a long term threat to future generations of native forests.It is also very difficult to manage in semi-wild areas, such as in large rural yards.
It can be controlled to some degree via labor-intensive methods such as cutting or burning the plant to root level and repeating at two-week intervals until nutrient reserves in the roots are depleted. It can also be controlled through annual applications of glyphosate, or through grubbing if high labor and soil destruction are not of concern. Cutting the honeysuckle to within 5–10 cm of the ground and then applying glyphosate has proven to be more effective, provided that the mixture is rather concentrated (20–25%) and is applied immediately after making the cut.
In urban environments of Southwest Ohio where deer population is high, some level of longer-term management has been observed by cutting the honeysuckle to within 18-24" of the ground. Grazing deer substantially slow down regrowth. Once the canopy from a stand of honeysuckle or that of an individual plant exceeds the grazing height of deer, this control method is ineffective. As recently as the late 1990s, Japanese honeysuckle was not considered to be part of a deer's diet, but by 2010 urban deer in southwest Ohio could be observed grazing on it with enthusiasm, especially freshly cut honeysuckle stocks.
Lonicera japonica contains methyl caffeate, 3,4-di-O-caffeoylquinic acid, methyl 3,4-di-O-caffeoylquinate, protocatechuic acid, methyl chlorogenic acid and luteolin. These compounds have an inhibitory effect on human platelet aggregation that may explain the possible role of Japanese honeysuckle in maintaining vascular homeostasis. The two biflavonoids, 3′-O-methyl loniflavone and loniflavone along with luteolin and chrysin can be isolated from the leaves. Other phenolic compounds present in the plant are hyperoside, chlorogenic acid and caffeic acid.
Traditional Chinese medicine
In traditional Chinese medicine, Lonicera japonica is called rěn dōng téng (Chinese: 忍冬藤; literally "winter enduring vine") or jīn yín huā (Chinese: 金銀花; literally "gold silver flower"). Alternative Chinese names include er hua and shuang hua. In Korean, it is called geumeunhwa. The dried leaves and flowers (Flos Lonicerae Japonicae) are employed in traditional Chinese medicine, being used to treat fever, headache, cough, thirst and sore throat.
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|Wikimedia Commons has media related to Lonicera japonica.|
- Plants For A Future: Lonicera japonica
- Species Profile- Japanese Honeysuckle (Lonicera japonica), National Invasive Species Information Center, United States National Agricultural Library. Lists general information and resources for Japanese Honeysuckle.