Cucumber flowers are easily distinguishable. Female flowers (shown in the image above) could have a small cucumber at the base of the flower, while male flowers (proven beneath) are just a cluster of flowers, no cucumber at their base. A properly deliberate out Hydroponic growing system sorted on paper http://waylonbpxek.jaiblogs.com/12887324/guideline-ideas-for-identifying-primary-issues-in-hydroponics