Since this is a time-consuming process, most hydroponic growers prefer the seedless/gynoecious cucumber varieties that set seedless fruit without the need for pollination. In this case you will need to transfer pollen from the male to the female flowers. (Also, some of these flowers will be male and naturally fall anyway.) If growing in a greenhouse or indoors, there also may not be any insects to carry out the pollination process. You can wait until after pollination has occurred and the small fruitlets have started to grow before selecting the largest fruitlet to grow in each node.Ī quick side note: Often, not all the flowers will pollinate if there are multiple flowers in each node. For large-fruited, seeded cucumbers, ideally only one fruit per node should be allowed to develop. In this case, excessive male flowers can be removed until the first female flowers are seen. These are flowers that don’t have the small cucumber fruitlet at the base as female flowers do. Often, early in the life of a seeded cucumber type, it will first produce a large number of male flowers. If you are growing the seeded American slicer or other similar large-fruited and seeded cucumbers, then the plants need both male and female flowers for pollination to occur. In this case, the small fruitlets, which have flowers attached to the end, would be thinned to one per node. If growing the large, seedless, continental greenhouse types-sometimes called European, Japanese, or English cucumbers, and are the most commonly grown hydroponically-then all the flowers should be female as the plants are gynoecious (that is, they only produce female flowers as pollination is not required to set and produce fruit). The small Lebanese or snacker cucumber varieties produce smaller fruit, so growers typically allow two to three fruits to set at each node as the plant can easily support these. However, flowering/fruitlet pruning depends very much on the type of cucumber you are growing. Often, if left to their own devices, the plant will naturally abort a number of small fruitlets, leaving only those that can be supported. Cucumber plants that are healthy and growing vigorously under good conditions can develop an excessive number of flowers-far more than the plant can successfully carry through to fruit maturity-particularly, early in the plant’s life.
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