Scientific Name(s) |
Reynoitria japonica R. sachaliensis or Polygonum cuspidatum |
Japanese Knotweed
|
Common Name |
Japanese Knotweed | |
Type |
Herbaceous perennial | |
Description |
6ft tall with cane like stem. Heart shaped leaves large. Tiny sprays of flowers late summer. Creeping stems | |
Habitat |
Roadsides. Railways banks, Riverbanks. | |
Folklore |
Edible shoots, delicacy in Japan Introduced from Japan after WW I. | |
Soil Type |
All |
|
Soil Fertility |
All |
|
Soil Moisture |
All, prefers moist. |
|
Soil pH |
3.5 to 8 |
|
Sunlight |
Full sun |
|
Success |
Vigorous underground stems supress all other growth. Small pice s of stem reproduce. Seeds remian dormant for long periods, will travel down rivers. |
|
Importance |
A serious notifiable weed in waste ground and riverbanks, smothering all native wildflowers |
|
Cultural Control |
Cultural (1.5) and (1.6) every week over several years. All Preventative (2.1 to 2.8) |
|
Chemical Control |
(3.1.1a) when mature in mid summer. |
Information Collated by James M. Burton as part of H.N.D. Course at Pencoed Agricultural College.
Chemical Information Correct as of 06:06:97. Always read and follow the instruction when using herbicides.