The bracken problem in the Highlands and Islands

Synopsis

The only serious attempt to quantify the area of bracken in Scotland took place in 1957. At that time the Department of Agriculture for Scotland, through the medium of the June Agricultural Census, asked farmers to assess the area of bracken on each holding.

The survey produced a figure of 187,500 ha of bracken-infested land throughout Scotland, of which some 50% was found in the Central, North and West Highland counties of Perth, Inverness and Argyll. One quarter (46,875 ha) of the Scottish total was located on the mainland and islands of Argyll.

Distribution is governed to a great extent by the soil type, exposure and rainfall, with the free-draining slopes of brown soil on the lower hill faces and glen sides providing the ideal habitat for the plant. The poorly drained acid peat as found over much of the Highland areas is an unsuitable medium for bracken growth but thin peat overlying mineral soil may be subject to bracken encroachment.

The crux of the problem lies in the imbalance of brown soils to peat land.

The limited areas of the mineral soils, which are located on the accessible lower slopes, have a marked potential for improved grazing and, by virtue of better drainage, are capable of more complete utilisation in an intensive stocking system.

Bracken control and subsequent grass sward establishment can form the key to greatly increased levels of productivity. This is illustrated by detailed reference to one farm in Argyll where over the past five years an attempt has been made to operate the Hill Farming Research Organization (H.F.R.O.) concept of a Two Pasture System.