Answer: Cucumbers produce both male and female flowers. Male flowers develop early in the season; female flowers follow, and later in the season you'll always have a variety of both male and female flowers. If you've decided your cucumber plant has only male flowers because it is not producing fruit, you may be incorrect. The plant may not be setting fruit because of heat stress or lack of pollination due to low insect activity. You might want to check the flowers more closely; male flowers grow on straight stems and female flowers have a small swelling directly behind the flowers. You can pollinate the female flowers by removing a male flower and rubbing the insides of the flowers together. This will transfer pollen and the females should produce fruit.
Best wishes with your cucumbers.
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