Invasion information | ||
Range in Japan | Almost entire Japan | |
Origin | Unknown. | |
Date | The first introduction was ca. 1900. Rapidly spread after W. W. II. | |
Route | Deliberate: As ornamental plant, as nectar source. | |
Impact | Actually: Competition with native species. Allelopathy. Native organism(s) affected: Native grasses. | |
Regulation in Japan | No action for prevention, mitigation, control, or eradication. | |
Introduced range in other countries | Unknown. |
Reference | Notes |
|
100 of the Japan’s Worst Invasive Alien Species |