Abstract
The system has been adopted at Dartington with Japanese larch ( Larix leptolepis ), and it has been suggested that it works there because Japanese larch grows fast. It is argued in this paper, however, that the system is best adapted to rather slowly growing trees, and the reason for its use with Japanese larch is that this species is characterized by a rapid height growth but a small current annual increment, so that, unless the trees are isolated, they make extremely narrow annual rings. With Douglas fir ( Pseudotsuga taxifolia ) and Sitka spruce ( Picea sitcbensis ) the annual rings might become too broad if this treatment were applied, except at a rather advanced age. Nevertheless, the system has certain other advantages and, to attain these, it may be useful to adopt it more extensively, even if the annual rings become broader than we like.
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