Invasion information | ||
Range in Japan | Almost entire Japan | |
Origin | Unknown. | |
Date | 1920s. | |
Route | Deliberate: As ornamental plant | |
Impact | Competition with native species, crops, pasture, etc. Allelopathy. An allergen of hay fever. Native organism(s) affected: Native grasses, crops, pasture, etc. | |
Regulation in Japan | No action for prevention, mitigation, control, or eradication. | |
Introduced range in other countries | East Asia. |
Reference | Notes |
|
100 of the Japan’s Worst Invasive Alien Species |