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Pumpkin plants and cucumbers also produce a substance called the glycoside cucurbitacin. It is he who gives bitterness. There is not much of this substance in the fruits. But when the plant is under stress, they start to become very bitter.
Cucumbers are stressed by sharp temperature fluctuations. Therefore, experienced gardeners advise to cover them during cold weather or at night, when it is warm during the day and cold at night. Greenhouse cucumbers rarely get bitter because they grow at a stable temperature.
With prolonged cooling, cucumbers go into survival mode. And the bitter substance accumulates very quickly. If they are watered with cold water below 20 degrees, this is also a stress for the plant and they will become bitter. Therefore, never water cucumbers with cold water.
Also, the increase of bitter substance in cucumbers can be affected by heat and dry air, uneven watering, lack of feeding, dense shade. Therefore, you should follow the rules of watering, fertilize on time, plant so that there is diffused light.
