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Pruning


By ThePresident - Posted on 05 July 2010

We are well into pruning now. The weekend saw us complete 29 of the 64 rows that make up the vineyard. Pruning is a very important part of growing good grapes and there are lots of theories about it. Pruning occurs while the vines are dormant.  Once the leaves have all fallen, usually in early June we start the long process. It generally takes one person one full day to prune one 400m row (approx 200 vines).  This year for the first time we used a mechanical "box pruner" to pre-prune the vines by trimming  off the excess growth.  This has made it easier for our small team of pruners to follow up and do the fine detailing of the each vine. The vines below have been box pruned. Before box pruning the canes were up to and higher than the top wires.

The next stage involves trimming the vines down to approximately 7-8 spurs on each side of the vine.

Each shoot will be left with just 2 spurs. This is important for setting the projected fuit loading for the coming season. It works bit like this.
Each vine will have on average 14 shoots; each shoot will have 2 buds. When grown in the spring each bud will produce a cane which will have 2 bunches of grapes. Each of these bunches will weight 100-120gms. There are 660 vines per acre. So if you are good at maths you will have worked out.

Spurs
buds
bunches
Weight
vines/acre
Tonne/acre
14
2
2
0.1
660
3.696

 Of course, it doesn’t ever go to plan, but if you don’t get it right at pruning, there is only grief ahead. Last year we got 2.4 tonnes/acre.
Pruning is a skilled job. It’s cold mornings, cool days; some nice sunshine if you are lucky and keep a rhythm going that lets you complete a vine in about 2 ½ minutes.