Photo from the fields. There was a small cucumber. Soon he will grow up. An interesting observation about bitter cucumbers. Bitterness is due to the content in the fruit of a special substance - cucurbitin. As a rule, blackish varieties are bitter, but the white-nosed varieties are not. ... So the sun, as some argue, not with it, although it is an indirect cause of the amount of cucurbitin.
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From @le0nid