In the January 1975 edition of Canadian Forest Industries, there was a report on a weed that threatens Washington forests. It is a bamboo-like plant that may grow as much as 12 feet in a season. In winter it falls back to form a thick brown mat which may become thick enough to smother young trees after a few years. It is called sachaline (Polygonum sachalinense F. Schmidt) and also known as giant knotweed.
This rhizomatous perennial, a native of Japan and tile Sachalin Islands, was introduced as an exotic into gardens in B.C. and the U.S.A. Although sachaline is an attractive plant, its rhizomatous habit makes it hard to control and therefore it has not been popular as an ornamental species.
In B.C. sachaline has become established in some areas of the Saanich Peninsula and the lower mainland. However it is not widespread.
It is unlikely that sachaline will be a serious threat to regeneration of forests in B.C. It is a broad-leaved, slow spreading perennial and as such, control by herbicide treatment should be very effective.
Should you be interested to know more about this weed, contact Mr. R. Annas, ecologist with the Research Division, B.C. Forest Service. Victoria (Telephone 387-3453)
[Abstract contains full text of memo.]
BC Forest Service - Research Division. 1976. Weed threatens Washington forests. British Columbia Ministry of Forests, Lands, Natural Resource Operations and Rural Development. Research Memo (FLNRORD). RM5
Topic: FLNRORD Research Program
Keywords: FLNRORD, Research Memo, British Columbia
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