| Summary: | Vegetative regeneration in Calluns vulgar1s (L.) Hull is governed by the 'intensity of heat produced during heath fires and, by the varying amounts of canopy removed through cutting or grazing. The significance of age upon the ability, of the plant to' regenerate vegetative has been, verified. The most favourable responses obtained from burning are those of plants ageing between 11 and 14 years, receiving 40 + 25 C. for approximately. 2 minutes, (controlled moor 'burning), Removal- of about 60 per cent of current year's growth on leading shoots., (light grazing) stimulates vigorous sprouting in a large number of potential sprouting centre's and, initiates the development of abundant side, shoots in Calluna under 14 years of age. Vegetative regeneration is reduced by burning at high temperatures and severe cutting; the application of such practices is not .recommended, particularly, on both young and old Calluna stands. Potential sprouting lare most abundant in the late building phase of the life-cyole of Calluna, i.e. between 11 and 14 years. with increasing age, the number' progressively . declines to a minimum, In the late mature phase, (up to 22 years); degenerate plants are normally unable to regenerate, Following controlled burning - or severe cutting - on vigorous plants, the now regenerating shoots emerge in dense group "clumps" originating from a large number of closely packed buds situated at engulfed bases of side, branches on undamaged parts of the main stems.
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