Why are some of our cucumbers bitter? We have to peel quite a bit off to get to the sweet meat and even after doing that they are still sometimes bitter.
Bitterness in cucumbers – and in zucchini, too – is related to water stress. The plant ran short of water while the fruit was developing. Sometimes, the bitterness permeates the entire fruit. The key to avoiding the bitterness, is to maintain an evenly moist root zone.