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Dessert wines are made from late harvested grapes when the sun has photosynthesised the maximum sugar from the vine into the grapes.
However, the plants also photosynthesised more, and produced 15 to 25 per cent more potatoes per hectare by weight - the only time this has ever been reported for a plant with just one extra gene.
Late summer pruning of apples and pears can be done now, cutting back surplus new shoots back to three or four buds to let light and air into the ripening fruits and to push the last of the sugar laden photosynthesised energy into the fruits for sweet ness and flavour.