Pick cucumbers at any stage of development before the seeds become hard. Cucumbers usually are eaten when immature. The best size depends upon the use and variety. They may be picked when they are no more than 2 inches long for pickles, 4 to 6 inches long for dills and 6 to 8 inches long for slicing varieties. A cucumber is of highest quality when it is uniformly green, firm and crisp. The large, burpless cucumbers should be 1 to 1 1/2 inches in diameter and up to 10 inches long. Some varieties can grow considerably larger. Do not allow cucumbers to turn yellow. Remove from the vine any missed fruits nearing ripeness so that the young fruits continue to develop. The cucumber fruit grows rapidly to harvest size and should be picked at least every other day.
Selection & Storage
There are two types of cucumbers common to the home gardener - pickling cucumbers and slicing cucumbers. The phrase "cool as a cucumber" is an apt one. Growing in a field on a hot summer day, the interior flesh is 20 degrees cooler than the outside air temperature.
Harvest cucumbers early in the morning (before have been heated by the afternoon sun) and refrigerate immediately. Store for up to 3 days in the refrigerator in loose or perforated plastic bags. Supermarket cucumbers are covered with an edible wax to protect them from moisture loss. The wax gives them an unnatural sheen. Fresh cucumbers are dull green in color.
Pickling cucumbers — Pickling cucumbers should be picked every day, since they can quickly grow too large for use. Do not leave over-mature, yellow cucumbers on the vine. If a single cucumber is left on the vine, the vine will stop producing altogether.
Slicing cucumbers — Slicing cucumbers should be harvested as needed. But there is no practical use for baseball bat size cucumbers. They are tough and the seeds are woody. Harvest when they are 8 inches long or smaller. As with pickling cucumbers, remove the over mature ones as soon as you see them or they will halt the growth of new cucumbers