Young stems may be pubescent while older stems are glabrous. Its evergreen to semi-evergreen nature gives it an added advantage over native species in many areas. 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. The species known as "bush honeysuckle" are upright deciduous shrubs with long arching branches, are commonly 6 to 20 feet tall, … In contrast, trumpet honeysuckle showed no influence of climbing supports on internode length or shoot biomass, and only a 25% increase in internode number [115]. Japanese Honeysuckle Lonicera japonica 2019 Status in Maine: Localized.Severely Invasive. Leaves: Leaves are simple, 1½-3½" long, oval, and opposite.Occasionally, leaves low on the vine may have rounded lobes. Although Japanese honeysuckle prefers moist, loamy soils, these ideal conditions can cause the plant to grow too vigorously. View this species on GBIF . In late summer, mowing (if possible) or cutting the vines needs to be followed up with an application of concentrated herbicide (glyphosate or triclopyr) to the cut wood. Japan What does it look like? Google. Even though Japanese honeysuckle is a highly desirable, highly utilized ornamental, it has quickly become a problem in the U.S. due to its fast growth rate and ability to displace native plant species. Handley CO, 1945. It prefers full sun, but it can grow in shaded environments. Photograph 1: Vine of flowering Japanese honeysuckle, by Ron Billings, TFS. Japanese Honeysuckle Lonicera japonica. The picture really reflects and faithfully plant that will be purchased and shipped. Habitats. Citation: National Biodiversity Data Centre, Ireland, Japanese Honeysuckle (Lonicera japonica), image, accessed 10 September 2020,