Cucumbers can turn yellow if they are overripe, diseased (such as by a virus), over-watered, or have nutrient deficiencies. (There are also yellow varieties, but it sounds like yours isn’t one of those.) Follow the harvesting recommendations for your particular variety — pickling cucumbers can be picked for gherkins around 1.5 to 2 inches long, or for dills from 3 to 6 inches long, depending on type. Check the health of the vine and leaves — any sign of disease or stress? If you suspect that your soil is low in nutrients, you might want to have it tested. You might also remove the yellow cucumbers to encourage more fruit set; it could be that the future cucumbers will be green and healthy.
Cucumbers can turn yellow if they are overripe, diseased (such as by a virus), over-watered, or have nutrient deficiencies. (There are also yellow varieties, but it sounds like yours isn’t one of those.) Follow the harvesting recommendations for your particular variety — pickling cucumbers can be picked for gherkins around 1.5 to 2 inches long, or for dills from 3 to 6 inches long, depending on type. Check the health of the vine and leaves — any sign of disease or stress? If you suspect that your soil is low in nutrients, you might want to have it tested. You might also remove the yellow cucumbers to encourage more fruit set; it could be that the future cucumbers will be green and healthy.