QuestionsHow to growFruitPlums and CherriesPlums 0 Vote Up Vote Down Alice O\’Shaughnessy asked 8 years ago The magpies are eating my plums even though they are not yet ripe. Should I bring them in to ripen on the windowsill, or just take my chances? 1 Answers 0 Vote Up Vote Down Gerry Daly Staff answered 6 years ago Immature plums will not ripen of the tree, only shrivel. Net the tree or part of it.Â