GlenlyonThere is no giant hogweed or Japanese knotweed in Glenlyon. A very small record of Himalayam balsam was made just below Keltneyburn, perhaps only 20 sq m.
The most significant invasive species in Glenlyon are not actually associated with watercourses as such.
13 records of rhododendrons were made. These were almost all associated with policy woodlands around some of the bigger estate houses in the glen, and it is thought that most of the records do not warrant any real priority status. There are two exceptions to this:
The small amount of the species present within the Glenlyon Woods SSSI site,
the very large concentration present in the woods above Garth House, seemingly extending to many hectares. This area was not recorded during our survey, there being no watercourses walked in that area, but the area is extremely obvious on passing from the road.
It is also known that there is a modest amount of rhododendrons present on the top of Drummond hill.
Several thousand sq m of white butterbur are present along the road in lower Glenlyon, between Garth House and Keltneyburn, and extending down the road towards Aberfeldy.
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