The nursery system belongs to the group of so-called tier nursery systems. In the early 1970s, the winegrower Scott Henry from the US state of Oregon (Umbqua Valley) had great problems with the vigorous growth of his vines in his vineyards. This manifested itself in compacted leaves, increased incidence of fungal diseases, declining yields and low colour intensity in red wine varieties. The vintner increased the pruning from two to four long fruit shoots. Henry distributed the developing shoots upwards and downwards (as in Smart-Dyson training). This resulted in a vertically divided foliage wall.
The system produces high yields and is suitable for mechanical use. It is a good alternative to trellis training. The main advantage over the latter is the 60% larger leaf surface and thus higher yields. Today, it is used in several variants in many wine-growing regions worldwide in locations where shoot growth is very vigorous. In Geisenheim, a special variant was developed with only half the cutting thickness, i.e. two fruiting canes. See a list of all systems under vine training.
By Farmer Karl - Own work, CC BY-SA 3.0, Link
For me, Lexicon from wein.plus is the most comprehensive and best source of information about wine currently available.
Egon Mark
Diplom-Sommelier, Weinakademiker und Weinberater, Volders (Österreich)