Cabernet Sauvignon with (left) and without nitrogen deficiency during bloom. Markus Keller To a casual observer, a cluster thick with berries might forecast a bumper crop. But with fruit set, what you see is not necessarily what you get, cautions ­Washington State University researcher Dr. Markus Keller. If you are looking for a predictor, count the flowers on your clusters. Better yet, he joked, hire an intern to do it. Growers can control the number of vines per acre at planting; they can control bud formation, as well as the number of shoots per bud, through pruning; and they can […]