Japanese privet (Ligustrum japonicum) is an evergreen shrub or small tree that is native to Japan and eastern Asia. It was introduced into the United States in 1945 as an ornamental.
Japanese Privet Toxic Components
All parts of L. japonicum contain syringin (ligustrin), which is an irritant glycoside. If ingested, it disrupts the horse's gastrointestinal system and can cause colic and renal damage.
What Japanese Privet Looks Like
Japanese privet has opposite green, leathery leaves, usually oblong or ovate with smooth margins. June through July, L. japonicum produces clusters of small fragrant, showy, white funnel-shaped flowers which ripen into drooping clusters of blue-black wax-coated berries. The berries mature in September to October and persist through the winter.
- Renal Damage
Young seedlings can be eﬀectively controlled by hand pulling.
CHEMICAL CONTROL: Spraying the foliage with a 2% solution of glyphosate or triclopyr and a 0.5% nonionic surfactant. Ideally, spraying should take place in the late fall or early spring when temperatures are above 65 degrees Fahrenheit and many native species are dormant.
- USDA SPECIES: Ligustrum spp. Fire Effects Information System. 2018.
- Early Detection & Distribution Mapping System Available online at http://www.eddmaps.org/; last accessed August 5, 2014. The University of Georgia - Center for Invasive Species and Ecosystem Health.. 2014.
- C Williams Ask the Expert - Is Wax Leaf Ligustrum poisonous to horses? Rutgers. 2013.
- Maddox, V., Byrd Jr, J., & Serviss, B Identification and control of invasive privets (Ligustrum spp.) in the middle southern United States. Invasive Plant Science and Management, 3(4), 482-488. 2010.
- Romani, Annalisa, et al. HPLC analysis of flavonoids and secoiridoids in leaves of Ligustrum vulgare L.(Oleaceae) Journal of agricultural and food chemistry 48.9 . 2000.
- Miller, James H Exotic invasive plants in southeastern forests Proceedings of exotic pests of eastern forests. Tennessee Exotic Pest Plant Council, Nashville, TN. 1997.
- Billeaud, Lorraine A., and Jayne M. Zajicek Influence of mulches on weed control, soil pH, soil nitrogen content, and growth of Ligustrum japonicum Journal of Environmental Horticulture 7.4. 1989.
- Inoue, Kenichiro, et al. Three secoiridoid glucosides from Ligustrum japonicum Phytochemistry 21.9 . 1982.